Translations:Cytochrome P450/30/en
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| Family | Function | Members | Genes | Pseudogenes |
| CYP1 | drug and steroid (especially estrogen) metabolism, benzo[a]pyrene toxification (forming (+)-benzo[a]pyrene-7,8-dihydrodiol-9,10-epoxide) | 3 subfamilies, 3 genes, 1 pseudogene | CYP1A1, CYP1A2, CYP1B1 | CYP1D1P |
| CYP2 | drug and steroid metabolism | 13 subfamilies, 16 genes, 16 pseudogenes | CYP2A6, CYP2A7, CYP2A13, CYP2B6, CYP2C8, CYP2C9, CYP2C18, CYP2C19, CYP2D6, CYP2E1, CYP2F1, CYP2J2, CYP2R1, CYP2S1, CYP2U1, CYP2W1 | Too many to list |
| CYP3 | drug and steroid (including testosterone) metabolism | 1 subfamily, 4 genes, 4 pseudogenes | CYP3A4, CYP3A5, CYP3A7, CYP3A43 | CYP3A51P, CYP3A52P, CYP3A54P, CYP3A137P |
| CYP4 | arachidonic acid or fatty acid metabolism | 6 subfamilies, 12 genes, 10 pseudogenes | CYP4A11, CYP4A22, CYP4B1, CYP4F2, CYP4F3, CYP4F8, CYP4F11, CYP4F12, CYP4F22, CYP4V2, CYP4X1, CYP4Z1 | Too many to list |
| CYP5 | thromboxane A2 synthase | 1 subfamily, 1 gene | CYP5A1 | |
| CYP7 | bile acid biosynthesis 7-alpha hydroxylase of steroid nucleus | 2 subfamilies, 2 genes | CYP7A1, CYP7B1 | |
| CYP8 | varied | 2 subfamilies, 2 genes | CYP8A1 (prostacyclin synthase), CYP8B1 (bile acid biosynthesis) | |
| CYP11 | steroid biosynthesis | 2 subfamilies, 3 genes | CYP11A1, CYP11B1, CYP11B2 | |
| CYP17 | steroid biosynthesis, 17-alpha hydroxylase | 1 subfamily, 1 gene | CYP17A1 | |
| CYP19 | steroid biosynthesis: aromatase synthesizes estrogen | 1 subfamily, 1 gene | CYP19A1 | |
| CYP20 | unknown function | 1 subfamily, 1 gene | CYP20A1 | |
| CYP21 | steroid biosynthesis | 1 subfamilies, 1 gene, 1 pseudogene | CYP21A2 | CYP21A1P |
| CYP24 | vitamin D degradation | 1 subfamily, 1 gene | CYP24A1 | |
| CYP26 | retinoic acid hydroxylase | 3 subfamilies, 3 genes | CYP26A1, CYP26B1, CYP26C1 | |
| CYP27 | varied | 3 subfamilies, 3 genes | CYP27A1 (bile acid biosynthesis), CYP27B1 (vitamin D3 1-alpha hydroxylase, activates vitamin D3), CYP27C1 (vitamin A1 to A2) | |
| CYP39 | 7-alpha hydroxylation of 24-hydroxycholesterol | 1 subfamily, 1 gene | CYP39A1 | |
| CYP46 | cholesterol 24-hydroxylase | 1 subfamily, 1 gene, 1 pseudogene | CYP46A1 | CYP46A4P |
| CYP51 | cholesterol biosynthesis | 1 subfamily, 1 gene, 3 pseudogenes | CYP51A1 (lanosterol 14-alpha demethylase) | CYP51P1, CYP51P2, CYP51P3 |