- Dehydrogenase/Reductase SDR Family, Member 7 (DHRS7)
 - Dihydrofolate Reductase (DHFR)
 - Dihydroorotate Dehydrogenase (DHODH)
 - Diacylglycerol-O-Acyltransferase Homolog 2 (DGAT2)
 - Diacylglycerol-O-Acyltransferase Homolog 1 (DGAT1)
 - 2,4-Dienoyl Coenzyme A Reductase 1 (DECR1)
 - Dolichyl Diphosphooligosaccharide Protein Glycosyltransferase (DDOST)
 - D-Aspartate Oxidase (DDO)
 - Dicarbonyl/L-Xylulose Reductase (DCXR)
 - Decapping Enzyme Scavenger (DCPS)
 - dCMP Deaminase (DCTD)
 - Debranching Enzyme Homolog 1 (DBR1)
 - Dihydrolipoamide Branched Chain Transacylase E2 (DBT)
 - D-Amino Acid Oxidase (DAO)
 - D2-Hydroxyglutarate Dehydrogenase (D2HGDH)