GO:0008401 retinoic acid 4-hydroxylase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008401 (retinoic acid 4-hydroxylase activity) is a molecular_function defined as the catalysis of the conversion of retinoic acid to 4-hydroxy-retinoic acid.
• The enzyme is a cytochrome P450 (historically annotated as CYP261) that is inducible by all-trans-retinoic acid itself, forming a negative-feedback catabolic loop.
• Inducibility of retinoic acid 4-hydroxylase varies between individuals and has been linked to clinical response to isotretinoin in acne patients.
• In head and neck squamous cell carcinoma, retinoic acid 4-hydroxylase-mediated catabolism of all-trans-retinoic acid has been studied in relation to cell proliferation.
• Pharmacological inhibition of retinoic acid catabolism, for example by liarozole, has been explored as a strategy to increase endogenous retinoic acid levels.
• Multi-omic studies implicate retinoic acid catabolic and signaling components in dermal fibrosis, regenerative repair, and hematopoietic stem cell identity.
Description
GO:0008401, retinoic acid 4-hydroxylase activity, is a molecular_function term describing the catalysis of the conversion of retinoic acid to 4-hydroxy-retinoic acid. This reaction is a key step in the oxidative catabolism of all-trans-retinoic acid, the active vitamin A derivative that controls gene expression through retinoic acid receptors. Because retinoic acid 4-hydroxylase activity reduces the cellular pool of active retinoic acid, it acts as a metabolic brake on retinoid signaling and is therefore central to the pharmacokinetics and pharmacodynamics of retinoids in physiology and medicine. Researchers study this activity because it determines how long and how strongly cells respond to retinoic acid. The enzyme is itself induced by all-trans-retinoic acid, creating a feedback loop that limits retinoid action. Inter-individual differences in the inducibility of retinoic acid 4-hydroxylase have been associated with clinical response to isotretinoin in patients with acne, making the activity a candidate biomarker and drug-metabolism node. In cancer biology, catabolism of all-trans-retinoic acid by this activity has been examined in head and neck squamous cell carcinoma in relation to cell proliferation. Beyond pharmacology, retinoic acid 4-hydroxylase activity is embedded in broader retinoic acid networks that influence stem cell identity, tissue repair, and developmental patterning. Multi-omic analyses have highlighted retinoic acid molecular drivers in dermal fibrosis and regenerative repair in the skin, and non-classical retinoic acid signaling has been linked to hematopoietic stem cell identity. In the zebrafish utricle, activity and retinoic acid together drive hair cell spatial patterning. These findings position GO:0008401 as a node where retinoid metabolism, cell fate, and disease intersect.
retinoic acid 4-hydroxylase activity At A Glance
| GO ID | GO:0008401 |
|---|---|
| GO term | retinoic acid 4-hydroxylase activity |
| Ontology | molecular_function |
| Synonym | cytochrome P450 CYP261 |
| Definition | Catalysis of the conversion of retinoic acid to 4-hydroxy-retinoic acid. |
| Major function | Oxidative catabolism of retinoic acid, reducing the pool of active retinoid available for receptor signaling. |
| Enzyme class | Cytochrome P450-type monooxygenase activity. |
| Inducibility | The activity is inducible by all-trans-retinoic acid, forming a negative-feedback loop. |
| Clinical relevance | Inducibility has been associated with clinical response to isotretinoin in acne; catabolism has been studied in head and neck squamous cell carcinoma. |
| Pharmacological context | Inhibition of retinoic acid catabolism has been explored with agents such as liarozole. |
What Is GO:0008401?
In simple terms, retinoic acid 4-hydroxylase activity is the enzymatic ability to add a hydroxyl group to retinoic acid, converting it into 4-hydroxy-retinoic acid. According to the QuickGO definition, GO:0008401 describes catalysis of the conversion of retinoic acid to 4-hydroxy-retinoic acid. This is an oxidative metabolic reaction that belongs to the cytochrome P450 family of monooxygenases, and the activity is historically associated with the synonym cytochrome P450 CYP261. Functionally, the reaction initiates the breakdown of active retinoic acid, thereby lowering the amount of retinoic acid available to activate retinoic acid receptors.
Why Is retinoic acid 4-hydroxylase activity Important in Cell Biology?
Retinoic acid 4-hydroxylase activity matters because it sets the lifetime and strength of retinoic acid signals inside cells. By converting retinoic acid to 4-hydroxy-retinoic acid, the enzyme reduces the ligand available for retinoic acid receptors, and because the enzyme is induced by retinoic acid itself, it creates a self-limiting feedback circuit. This regulatory logic is directly relevant to how patients respond to retinoid drugs: inducibility of retinoic acid 4-hydroxylase has been linked to clinical response to isotretinoin in acne, and pharmacological inhibition of retinoic acid catabolism has been pursued to boost endogenous retinoid levels. The activity also intersects with cancer cell proliferation and with broader retinoic acid-dependent programs in stem cell identity, skin repair, and developmental patterning, making it a recurring node in studies of differentiation, fibrosis, and regeneration.
• Controls the catabolic clearance of all-trans-retinoic acid, thereby limiting retinoic acid receptor signaling.
• Forms a negative-feedback loop because the activity is induced by retinoic acid itself.
• Inducibility has been associated with clinical response to isotretinoin in patients with acne.
• Pharmacological inhibition of retinoic acid catabolism, such as with liarozole, has been explored to raise endogenous retinoic acid.
• Retinoic acid 4-hydroxylase-mediated catabolism of all-trans-retinoic acid has been studied in head and neck squamous cell carcinoma in relation to cell proliferation.
• Retinoic acid molecular drivers, including catabolic and signaling components, have been implicated in dermal fibrosis and regenerative repair in the skin.
• Non-classical retinoic acid signaling has been linked to hematopoietic stem cell identity in multilayer omics analyses.
• Activity and retinoic acid together drive hair cell spatial patterning in the zebrafish utricle.
• Naturally occurring diterpenes can act as retinoic acid receptor agonists, connecting retinoid chemistry to receptor activation.
• The activity is a cytochrome P450-type monooxygenase historically annotated as CYP261, making it a target for metabolic and pharmacological studies.
Molecular Mechanism of retinoic acid 4-hydroxylase activity
Substrate recognition and binding of retinoic acid
In simple terms: The enzyme first grabs retinoic acid so it can be modified.
Retinoic acid 4-hydroxylase activity acts on retinoic acid as its substrate, converting it to 4-hydroxy-retinoic acid. The activity is inducible by all-trans-retinoic acid, which means that exposure to the substrate increases the capacity of cells to carry out this conversion. This substrate-driven induction is a defining feature of the activity and underlies the feedback control of retinoic acid levels.
Cytochrome P450-type oxidative catalysis
In simple terms: The enzyme uses an oxidative reaction to add a hydroxyl group to retinoic acid.
The activity is a cytochrome P450-type monooxygenase, historically referred to by the synonym cytochrome P450 CYP261, and it catalyzes the conversion of retinoic acid to 4-hydroxy-retinoic acid. This oxidative modification is the first committed step in the catabolic pathway that clears active retinoic acid. The reaction reduces the amount of retinoic acid available to activate retinoic acid receptors, thereby dampening retinoid signaling.
Feedback regulation by retinoic acid itself
In simple terms: When retinoic acid levels rise, the cell makes more of the enzyme that destroys it.
A central regulatory feature of retinoic acid 4-hydroxylase activity is its inducibility by all-trans-retinoic acid. This creates a negative-feedback loop in which retinoic acid promotes its own catabolism, limiting the duration and intensity of retinoic acid signaling. Inter-individual differences in this inducibility have been associated with clinical response to isotretinoin in patients with acne, suggesting that the feedback loop has pharmacological consequences.
Pharmacological modulation of the activity
In simple terms: Drugs can block this enzyme to keep retinoic acid around longer.
Because retinoic acid 4-hydroxylase activity lowers retinoic acid levels, inhibiting the activity is a strategy to increase endogenous retinoic acid. Liarozole has been described as an agent in this pharmacological space. In cancer contexts, retinoic acid 4-hydroxylase-mediated catabolism of all-trans-retinoic acid has been studied in head and neck squamous cell carcinoma in relation to cell proliferation, linking the activity to tumor cell behavior.
Integration with retinoic acid signaling networks
In simple terms: This enzyme is one part of a larger retinoic acid control system.
Retinoic acid 4-hydroxylase activity operates within broader retinoic acid networks that include receptor-mediated and non-classical signaling. Multi-omic analysis has revealed retinoic acid molecular drivers for dermal fibrosis and regenerative repair in the skin, and a non-classical retinoic acid signaling axis has been shown to regulate hematopoietic stem cell identity. In the zebrafish utricle, activity and retinoic acid together drive hair cell spatial patterning, and naturally occurring diterpenes can act as retinoic acid receptor agonists, connecting retinoid metabolism to receptor activation.
Key Genes Involved in GO:0008401 retinoic acid 4-hydroxylase activity
The following genes and proteins are directly or contextually linked to retinoic acid 4-hydroxylase activity, retinoic acid catabolism, and retinoic acid signaling in the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CYP26A1 | Cytochrome P450 enzyme associated with retinoic acid 4-hydroxylase activity and retinoic acid catabolism | Studied as the inducible all-trans-retinoic acid 4-hydroxylase that converts retinoic acid to 4-hydroxy-retinoic acid |
| CYP26B1 | Retinoic acid-catabolizing cytochrome P450 family member | Part of the retinoic acid catabolic network that controls retinoic acid availability |
| CYP26C1 | Retinoic acid-catabolizing cytochrome P450 family member | Contributes to retinoic acid clearance and feedback regulation |
| RARA | Retinoic acid receptor alpha | Mediates retinoic acid signaling that is attenuated when retinoic acid is catabolized |
| RARB | Retinoic acid receptor beta | Retinoic acid receptor involved in transcriptional responses to retinoids |
| RARG | Retinoic acid receptor gamma | Retinoic acid receptor contributing to retinoid-dependent gene regulation |
| RXRA | Retinoid X receptor alpha | Heterodimerization partner for retinoic acid receptors in retinoid signaling |
| ALDH1A1 | Retinaldehyde dehydrogenase involved in retinoic acid synthesis | Synthesis enzyme that sets the retinoic acid pool subject to 4-hydroxylation |
| ALDH1A2 | Retinaldehyde dehydrogenase involved in retinoic acid synthesis | Synthesis enzyme contributing to retinoic acid availability |
| ALDH1A3 | Retinaldehyde dehydrogenase involved in retinoic acid synthesis | Synthesis enzyme contributing to retinoic acid availability |
| CRABP1 | Cellular retinoic acid-binding protein | Modulates intracellular retinoic acid handling and availability |
| CRABP2 | Cellular retinoic acid-binding protein | Modulates intracellular retinoic acid handling and availability |
| RBP1 | Retinol-binding protein involved in retinoid metabolism | Supports retinoid substrate supply for retinoic acid metabolism |
| RBP4 | Retinol-binding protein in circulation | Contributes to systemic retinol transport and retinoid availability |
| CYP26A1 (zebrafish ortholog) | Retinoic acid catabolism in developmental patterning | Studied in zebrafish utricle hair cell spatial patterning together with retinoic acid activity |
| CYP26B1 (zebrafish ortholog) | Retinoic acid catabolism in developmental patterning | Contributes to retinoic acid gradients in developing tissues |
| RARA (hematopoietic context) | Retinoic acid receptor in stem cell identity | Linked to non-classical retinoic acid signaling that regulates hematopoietic stem cell identity |
| RARG (skin fibrosis context) | Retinoic acid receptor in dermal repair | Associated with retinoic acid molecular drivers of dermal fibrosis and regenerative repair |
How Is retinoic acid 4-hydroxylase activity Regulated?
Retinoic acid 4-hydroxylase activity is regulated primarily by its substrate: all-trans-retinoic acid induces the activity, establishing a negative-feedback loop that limits retinoic acid signaling. This inducibility is not uniform across individuals; differences in inducibility have been associated with clinical response to isotretinoin in patients with acne, indicating that host-specific regulation of the activity influences drug outcomes. Pharmacological regulation is also possible, as agents such as liarozole have been described in the context of retinoic acid catabolism. At the network level, retinoic acid signaling itself, including non-classical axes, is integrated with stem cell and tissue-repair programs, so the activity is embedded in broader regulatory circuits rather than acting in isolation.
retinoic acid 4-hydroxylase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CYP26A1 | Acne and variable response to isotretinoin | Knockout or overexpression in keratinocyte or sebocyte models with retinoid treatment |
| CYP26A1 | Head and neck squamous cell carcinoma proliferation | Knockout or point-mutation in head and neck squamous cell carcinoma cell lines |
| CYP26 family | Dermal fibrosis and regenerative repair | Knockout or overexpression in skin fibroblast and organoid models |
| CYP26 family | Hematopoietic stem cell identity | Knockout or tagged knock-in in hematopoietic stem cell models |
| CYP26 family | Hair cell spatial patterning in the zebrafish utricle | Knockout or knock-in in zebrafish developmental models |
Acne and response to isotretinoin
Retinoic acid 4-hydroxylase inducibility has been examined in patients with acne and related to clinical response to isotretinoin. Because the activity clears all-trans-retinoic acid, differences in how strongly it is induced can alter the effective retinoid exposure achieved during therapy. This makes the activity a candidate factor in explaining variability in retinoid treatment outcomes.
Head and neck squamous cell carcinoma
In head and neck squamous cell carcinoma, retinoic acid 4-hydroxylase-mediated catabolism of all-trans-retinoic acid has been studied in relation to cell proliferation. Enhanced catabolism of retinoic acid can lower the amount of ligand available for retinoic acid receptors, which is relevant to differentiation and growth control in cancer cells. This work connects GO:0008401 directly to tumor cell biology.
Dermal fibrosis and regenerative repair
Multi-omic analysis has revealed retinoic acid molecular drivers for dermal fibrosis and regenerative repair in the skin. These findings place retinoic acid metabolism and signaling, including catabolic control of retinoic acid levels, within the biology of fibrotic versus regenerative skin responses. The study highlights retinoic acid-related molecular programs as potential levers in skin repair.
Hematopoietic stem cell identity and developmental patterning
A non-classical retinoic acid signaling axis has been shown by multilayer omics analysis to regulate hematopoietic stem cell identity. In the zebrafish utricle, activity and retinoic acid together drive hair cell spatial patterning, illustrating a developmental role for retinoic acid gradients and catabolism. Together these studies show that retinoic acid catabolic activity participates in stem cell and patterning decisions beyond classical receptor signaling.
From retinoic acid 4-hydroxylase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of retinoic acid 4-hydroxylase activity increase retinoic acid signaling? | CRISPR knockout of the relevant CYP26 gene in a retinoid-responsive cell line |
| Does a specific catalytic residue mediate retinoic acid 4-hydroxylation? | CRISPR point mutation of the catalytic residue followed by retinoid metabolite measurement |
| Can an inducible or tagged allele report enzyme localization and inducibility? | CRISPR knock-in of a tag or inducible cassette at the endogenous locus |
| Does overexpression of the enzyme reduce retinoic acid levels and alter proliferation? | CRISPR overexpression or cDNA overexpression in cancer cell lines |
| Does modulation of the activity change clinical retinoid response phenotypes? | Patient-derived or isogenic models with differential inducibility |
| Does the activity shape developmental patterning? | Zebrafish knockout or knock-in models of the orthologous gene |
How to Study the retinoic acid 4-hydroxylase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS retinoid profiling | Levels of retinoic acid and 4-hydroxy-retinoic acid | Direct assessment of retinoic acid 4-hydroxylase activity |
| Transcriptomic profiling | Gene expression changes in retinoid-related networks | Identifying retinoic acid molecular drivers in skin and stem cell models |
| Multi-omic integration | Combined layers of molecular data | Revealing non-classical retinoic acid signaling axes |
| Cell proliferation assays | Growth and viability of treated cells | Testing catabolism effects in head and neck squamous cell carcinoma |
| Differentiation marker assays | Expression of lineage markers | Assessing retinoid responses in cancer and skin models |
| Developmental imaging | Spatial patterning of cells in vivo | Studying hair cell patterning in the zebrafish utricle |
| Pharmacological inhibition assays | Effect of catabolism inhibitors on retinoid levels | Evaluating agents such as liarozole in retinoid biology |
| Receptor agonist assays | Retinoic acid receptor activation by compounds | Testing naturally occurring diterpenes and retinoid analogs |
Measuring retinoic acid and 4-hydroxy-retinoic acid by mass spectrometry
Because GO:0008401 is defined by the conversion of retinoic acid to 4-hydroxy-retinoic acid, direct measurement of substrate and product is a core method. Liquid chromatography coupled to mass spectrometry can quantify retinoid species in cells and tissues, allowing researchers to infer enzyme activity from metabolite ratios. Such measurements are essential when testing whether genetic or pharmacological perturbations alter retinoic acid catabolism.
Transcriptional and multi-omic profiling of retinoid networks
Multi-omic analyses have been used to reveal retinoic acid molecular drivers in dermal fibrosis and regenerative repair in the skin, and multilayer omics has uncovered a non-classical retinoic acid signaling axis regulating hematopoietic stem cell identity. Transcriptomic and multi-omic profiling can therefore place retinoic acid 4-hydroxylase activity within broader gene regulatory networks. These approaches help identify co-regulated genes and pathways that respond when the activity is perturbed.
Cell proliferation and differentiation assays
In head and neck squamous cell carcinoma, retinoic acid 4-hydroxylase-mediated catabolism of all-trans-retinoic acid has been studied in relation to cell proliferation. Proliferation assays, differentiation markers, and viability measurements can be combined with retinoid treatment to test how catabolic activity influences cell behavior. Such assays are also relevant to acne-related studies of isotretinoin response.
Developmental and patterning assays in model organisms
In the zebrafish utricle, activity and retinoic acid together drive hair cell spatial patterning, making developmental models useful for studying the activity in vivo. Imaging and patterning quantification in such models can reveal how retinoic acid gradients and catabolism shape tissue organization. These approaches complement cell-based assays of enzyme activity.
How CRISPR Can Be Used to Study GO:0008401 retinoic acid 4-hydroxylase activity
Knockout
CRISPR knockout of the gene encoding retinoic acid 4-hydroxylase activity can be used to remove the enzyme and test whether retinoic acid catabolism is required for a given phenotype. Loss of the activity is expected to increase retinoic acid availability and enhance retinoic acid receptor signaling, which can be measured by retinoid profiling and transcriptional readouts. Knockout models are also useful for studying proliferation effects in cancer cell lines where retinoic acid catabolism has been implicated.
Point Mutation
CRISPR point mutation can be used to alter specific residues within the catalytic domain of the cytochrome P450 enzyme responsible for retinoic acid 4-hydroxylase activity. Such mutants allow researchers to separate catalytic activity from other functions of the protein and to test structure-function relationships. Point-mutant models are particularly valuable when the goal is to determine whether the enzymatic conversion of retinoic acid to 4-hydroxy-retinoic acid is the relevant activity in a phenotype.
Knock-in
CRISPR knock-in can introduce tags, reporters, or inducible cassettes at the endogenous locus of the gene encoding retinoic acid 4-hydroxylase activity. Tagged knock-in alleles enable visualization and quantification of enzyme expression and localization under conditions where retinoic acid induces the activity. Inducible knock-in systems can also be used to control the timing of enzyme expression in developmental or stem cell models.
Overexpression
CRISPR overexpression or cDNA-based overexpression of the retinoic acid 4-hydroxylase gene can be used to increase catabolic capacity and reduce retinoic acid levels. This approach is useful for testing whether enhanced catabolism blunts retinoic acid signaling and alters phenotypes such as proliferation in cancer cells. Overexpression models also help evaluate whether the activity is sufficient to drive changes in retinoid-dependent gene expression.
How EDITGENE Supports retinoic acid 4-hydroxylase activity Research
Researchers studying retinoic acid 4-hydroxylase activity-related genes often need to determine whether a candidate gene is causally involved in retinoid metabolism, signaling, or disease phenotypes. Establishing causality typically requires precise genetic models in which the gene can be deleted, mutated, tagged, or overexpressed in a controlled manner. EDITGENE provides these models together with screening and bioinformatics support so that hypotheses about GO:0008401 can be tested rigorously in relevant cell systems.
Contact EDITGENE today to design your custom CRISPR model for retinoic acid 4-hydroxylase activity research.
Frequently Asked Questions About retinoic acid 4-hydroxylase activity
What is retinoic acid 4-hydroxylase activity?
Retinoic acid 4-hydroxylase activity is a molecular_function annotated as GO:0008401, defined as catalysis of the conversion of retinoic acid to 4-hydroxy-retinoic acid.
What is the GO ID for retinoic acid 4-hydroxylase activity?
The GO ID is GO:0008401, with the official name retinoic acid 4-hydroxylase activity and the synonym cytochrome P450 CYP261.
What does retinoic acid 4-hydroxylase do in the cell?
It converts retinoic acid to 4-hydroxy-retinoic acid, reducing the pool of active retinoic acid available for receptor signaling and thereby limiting retinoid responses.
Is retinoic acid 4-hydroxylase activity inducible?
Yes, the activity is inducible by all-trans-retinoic acid, which creates a negative-feedback loop that limits retinoic acid signaling.
What genes are involved in retinoic acid 4-hydroxylase activity?
Cytochrome P450 family genes associated with retinoic acid catabolism, including CYP26A1, CYP26B1, and CYP26C1, are central, together with retinoid synthesis and receptor genes such as ALDH1A1, ALDH1A2, ALDH1A3, RARA, RARB, RARG, and RXRA.
How is retinoic acid 4-hydroxylase activity related to acne treatment?
Inducibility of retinoic acid 4-hydroxylase has been examined in patients with acne and related to clinical response to isotretinoin, suggesting that differences in catabolic capacity may influence treatment outcomes.
Is retinoic acid 4-hydroxylase activity involved in cancer?
In head and neck squamous cell carcinoma, retinoic acid 4-hydroxylase-mediated catabolism of all-trans-retinoic acid has been studied in relation to cell proliferation.
Can retinoic acid 4-hydroxylase activity be inhibited pharmacologically?
Pharmacological modulation of retinoic acid catabolism has been explored, and liarozole has been described in this context.
How do researchers measure retinoic acid 4-hydroxylase activity?
Researchers often measure retinoic acid and 4-hydroxy-retinoic acid levels directly, for example by mass spectrometry, and combine this with transcriptional and phenotypic assays.
How can CRISPR be used to study retinoic acid 4-hydroxylase activity?
CRISPR knockout, point mutation, knock-in, and overexpression can be used to delete, alter, tag, or amplify the enzyme, allowing causal tests of its role in retinoid metabolism and disease phenotypes.
Conclusion
GO:0008401, retinoic acid 4-hydroxylase activity, defines the enzymatic conversion of retinoic acid to 4-hydroxy-retinoic acid and serves as a key control point in retinoid catabolism. Its inducibility by retinoic acid creates a feedback loop that shapes the strength and duration of retinoid signaling, with consequences for drug response, cancer cell behavior, skin repair, stem cell identity, and developmental patterning. Because the activity sits at the intersection of metabolism, signaling, and disease, precise genetic models are essential for rigorous study. CRISPR-based knockout, point-mutation, knock-in, and overexpression approaches, combined with metabolite profiling and multi-omic analysis, provide a practical route to test how this activity contributes to normal physiology and pathology.
References
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- 2. Bryson HM et al.. 1996. Liarozole.. Drugs Aging 9(6):478-84; discussion 485 PMID: 8972247
- 3. Wang F et al.. 2009. Retinoic acid 4-hydroxylase inducibility and clinical response to isotretinoin in patients with acne.. J Am Acad Dermatol 61(2):252-8 PMID: 19525031
- 4. Baeza-Loya S et al.. 2026. Activity and retinoic acid drive hair cell spatial patterning in the zebrafish utricle.. Development 153(6) PMID: 41867051
- 5. Tanabe H et al.. 2014. Retinoic acid receptor agonist activity of naturally occurring diterpenes.. Bioorg Med Chem 22(12):3204-12 PMID: 24799257
- 6. Kim SY et al.. 2002. Retinoic acid 4-hydroxylase-mediated catabolism of all-trans retinoic acid and the cell proliferation in head and neck squamous cell carcinoma.. Metabolism 51(4):477-81 PMID: 11912557
- 7. Schönberger K et al.. 2022. Multilayer omics analysis reveals a non-classical retinoic acid signaling axis that regulates hematopoietic stem cell identity.. Cell Stem Cell 29(1):131-148.e10 PMID: 34706256
- 8. White JA et al.. 1996. Identification of the retinoic acid-inducible all-trans-retinoic acid 4-hydroxylase.. J Biol Chem 271(47):29922-7 PMID: 8939936
