| AKR | aldo-keto reductase |
| CRBP | cellular retinol binding protein |
| CRABP | cellular retinoic acid binding protein |
| CYP | cytochrome P450 |
| DHRS | dehydrogenase/reductase (SDR family) member |
| LRAT | lecithin:retinol acyltransferase |
| NAD | nicotinamide adenine dinucleotide |
| NADP | nicotinamide adenine dinucleotide phosphate |
| NHR | nuclear hormone receptor |
| RA | all-trans-retinoic acid |
| RAR | retinoic acid receptor |
| RXR | retinoid X receptor |
| RALDH | retinaldehyde dehydrogenase |
| RDH | retinol dehydrogenase |
| SDR | short-chain dehydrogenases reductase |
| TTR | transthyretin |