| Retinol dehydrogenase 13 | Humans | Retinol dehydrogenase with a clear preference for NADP. Oxidizes all-trans-retinol, but seems to reduce all-trans-ret... more | 1 | Details |
| Retinol dehydrogenase 14 | Humans | Retinol dehydrogenase with a clear preference for NADP. Displays high activity towards 9-cis, 11-cis and all-trans-re... more | 1 | Details |
| Retinol dehydrogenase 16 | Humans | Oxidoreductase with a preference for NAD. Oxidizes all-trans-retinol, 9-cis-retinol, 11-cis-retinol and 13-cis-retino... more | 1 | Details |
| Retinol dehydrogenase 5 | Humans | Catalyzes the oxidation of cis-isomers of retinol, including 11-cis-, 9-cis-, and 13-cis-retinol in an NAD-dependent ... more | 3 | Details |
| Retinol dehydrogenase 8 | Humans | Retinol dehydrogenase with a clear preference for NADP. Converts all-trans-retinal to all-trans-retinol. May play a r... more | 1 | Details |
| Retinol-binding protein 1 | Humans | Cytoplasmic retinol-binding protein. Accepts retinol from the transport protein STRA6, and thereby contributes to ret... more | 3 | Details |
| Retinol-binding protein 2 | Humans | Intracellular transport of retinol | 2 | Details |
| Retinol-binding protein 3 | Humans | Mediates the transport of 11-cis- and all-trans-retinoids between the retinal pigment epithelium (RPE) and photorecep... more | 3 | Details |
| Retinol-binding protein 4 | Humans | Retinol-binding protein that mediates retinol transport in blood plasma. Delivers retinol from the liver stores to th... more | 8 | Details |
| Retinol-binding protein 5 | Humans | Intracellular transport of retinol | 2 | Details |
| Reverse transcriptase | HBV | Not Available | 8 | Details |
| Reverse transcriptase/RNaseH | Human immunodeficiency virus 1 | Not Available | 41 | Details |
| Rhamnulose-1-phosphate aldolase | Escherichia coli (strain K12) | Catalyzes the reversible cleavage of L-rhamnulose-1-phosphate to dihydroxyacetone phosphate (DHAP) and L-lactaldehyde... more | 1 | Details |
| Rhesus blood group D antigen | Humans | Not Available | 2 | Details |
| Rho-associated protein kinase 1 | Humans | Protein kinase which is a key regulator of the actin cytoskeleton and cell polarity. Involved in regulation of smooth... more | 13 | Details |
| Rho-associated protein kinase 2 | Humans | Protein kinase which is a key regulator of actin cytoskeleton and cell polarity. Involved in regulation of smooth mus... more | 13 | Details |
| Rho-related GTP-binding protein RhoB | Humans | Mediates apoptosis in neoplastically transformed cells after DNA damage. Not essential for development but affects ce... more | 1 | Details |
| Rho-related GTP-binding protein RhoE | Humans | Binds GTP but lacks intrinsic GTPase activity and is resistant to Rho-specific GTPase-activating proteins | 1 | Details |
| Rhodopsin | Humans | G protein-coupled photoreceptor that activates the G protein transducin (t) signaling pathway in response to light an... more | 14 | Details |
| Rhomboid protease GlpG | Escherichia coli (strain K12) | Rhomboid-type serine protease that catalyzes intramembrane proteolysis. | 2 | Details |
| Rhomboid protease GlpG | Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd) | Rhomboid-type serine protease that catalyzes intramembrane proteolysis. | 1 | Details |
| Rhoptry neck protein 3 | Plasmodium falciparum (isolate 3D7) | Not Available | 1 | Details |
| Ribitol 5-phosphate transferase FKRP | Humans | Catalyzes the transfer of a ribitol 5-phosphate from CDP-L-ribitol to the ribitol 5-phosphate previously attached by ... more | 1 | Details |
| Riboflavin biosynthesis protein | Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099) | Not Available | 3 | Details |
| Riboflavin kinase | Humans | Catalyzes the phosphorylation of riboflavin (vitamin B2) to form flavin-mononucleotide (FMN), hence rate-limiting enz... more | 2 | Details |