Human Cytochrome P450s

Note on Jan. 24, 2007 I have completed a total revision of this page.

On May 17, I added links to the Human Gene Nomenclature Committee names (HGNC).

Last revised May 17, 2007

I have tried to make this table as up to date as possible. Entrez Gene, OMIM, Unigene and all other links have been checked and updated.

I have included seven gene cluster maps that show human, mouse and rat compared (red links in the first column).

These maps are further described in:

Comparison of cytochrome P450 (CYP) genes from the mouse and human genomes

Pharmacogenetics 14, 1-18 2004

The Entrez Gene site has extensive data and links for intact sequences and some pseudogenes.

For a complete set of human P450 sequences including pseudogenes go to the FASTA file

All human P450 genes and all P450 pseudogenes are included in this table.

This table contains more than 700 links to human P450 data, including known crystal structures.

CYP names in column 1 are linked to their protein sequences, including the pseudogenes.

X at the end of a CYP name means that name has been discontinued and replaced by a new name

Pseudogenes are named using suffixes to specify the four types of pseudogenes defined as:

P is a full length or near full length pseudogene, it may be near or far from other P450s.

-ps is equivalent to P, but it is required nomenclature for mouse full length pseudogenes.

-de stands for detritus exons (found near other full length genes).

-se stands for solo exons, one or a few exons found distant from a P450 gene.

-ie stands for internal exons, duplicate exons found inside some P450 genes.

CYP	Genbank	RefSeq mRNA	Genomic Assemblies	RefSeq Protein	OMIM	HGNC	Unigene	EntrezGene	comments
1A1	see related sequences under the Entrez Gene link	NM_000499	see reference assembly under the Entrez Gene link	NP_000490	108330	2595	Hs.72912 (70 ESTs)	CYP1A1	15q24.1
1A2	see related sequences under the Entrez Gene link	NM_000761	see reference assembly under the Entrez Gene link	NP_000752	124060	2596	Hs.1361 (26 ESTs)	CYP1A2	15q24.1
1D1P/1A8P	AL359997.8	no entry	NT_023935.17	no entry	no entry	hold	no entry	no entry	9q21.12 43% identical to 1A2, ortholog to Danio 1D1
1B1	see related sequences under the Entrez Gene link	NM_000104	see reference assembly under the Entrez Gene link	NP_000095	601771 see additional entries under phenotypes in the Entrez Gene link	2597	Hs.154654 (584 ESTs)	CYP1B1	2p22.2
2A 2ABFGST gene cluster map	see related sequences under the Entrez Gene link	no entry	NG_000008	no entry	123960	2607	no entry	CYP2ABFGST cluster	19q13.2
2A6	see related sequences under the Entrez Gene link	NM_000762	see reference assembly under the Entrez Gene link	NP_000753	122720	2610	Hs.439056 (217 ESTs)	CYP2A6	19q13.2 Structures 2FDY 2FDW 2FDV 2FDU 1Z11 1Z10
2A6v2	U22027	no entry	no entry	no entry	122720	hold	no entry	CYP2A6	*2A63 allele**
2A7v1	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	608054	2611	Hs.250615 (34 ESTs)	CYP2A7	19q13.2 wt seq
2A7v2	U22029	NM_000764	see related sequences under the Entrez Gene link	NP_000755	608054	hold	Hs.250615 (34 ESTs)	CYP2A7	19q13.2 hybrid, exon 8 from 2A18PC
2A7_v1axΔ2a	NM_030589	NM_030589	see reference assembly under the Entrez Gene link	NP_085079.2	no entry	hold	Hs.250615 (34 ESTs)	CYP2A7	19q13.2 alt. splice, exon 2 deleted
2A7PTX	U22030	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2612	Hs.250615 (34 ESTs)	2A7 pseudogene N-term.	identical to 2A18PN
2A7PCX	U22044	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2612	Hs.250615 (34 ESTs)	2A7 pseudogene N-term.	identical to 2A18PN
2A13	see related sequences under the Entrez Gene link	NM_000766	see reference assembly under the Entrez Gene link	NP_000757	no entry	2608	Hs.181973 (1 EST)	CYP2A13	19q13.2
2A18PC	AC008537.5	no entry	NT_011109.15	no entry	no entry	2612	no entry	no entry	opposite end of 2A18PN
2A18PN	AC008537.5	no entry	NT_011109.15	no entry	no entry	hold	Hs.250615 (34 ESTs)	2A7 pseudogene N-term.	formerly 2A7PT and 2A7PC
2B	no entry	no entry	NT_011109.15	no entry	123930	2614	no entry	CYP2B subfamily	19q13.2
2B6	see related sequences under the Entrez Gene link	NM_000767	see reference assembly under the Entrez Gene link	NP_000758	123930	2615	Hs.1360 (38 ESTs)	CYP2B6	19q13.2
2B7P1	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2616	Hs.529117 (62 ESTs)	CYP2B71P	HIIB3
2B7P2X	AC011541.7	no entry	NT_011109.15	no entry	no entry	hold	no entry	no entry	exon 1 only, error = 2B6
2B7P3X	AC008539.6	no entry	NT_011109.15	no entry	no entry	hold	no entry	no entry	exon 1 only, error = 2B6
2C8 2C gene cluster map	see related sequences under the Entrez Gene link	NM_000770	see reference assembly under the Entrez Gene link	NP_000761	601129	2622	Hs.282871 (188 ESTs)	CYP2C8	10q23.33 Structures 1PQ2
2C8-de6b	AL359672.19	no entry	NT_030059.12	no entry	no entry	hold	no entry	no entry	detritus exon 6 near 2C8
2C9	see related sequences under the Entrez Gene link	NM_000771	see reference assembly under the Entrez Gene link	NP_000762	601130	2623	Hs.282624 (182 ESTs)	CYP2C9	10q23.33 Structures 1R9O 1OG5 1OG2
2C9-de1b	AL359672.19	no entry	NT_030059.12	no entry	no entry	hold	no entry	no entry	detritus exon 1 near 2C9
2C9-de2c3c	AL359672.19	no entry	NT_030059.12	no entry	no entry	hold	no entry	no entry	detritus exons 2,3 near 2C9
2C18	see related sequences under the Entrez Gene link	NM_000772	see reference assembly under the Entrez Gene link	NP_000763	601131	2620	Hs.511872 (38 ESTs)	CYP2C18	10q23.33
2C19	see related sequences under the Entrez Gene link	NM_000769	see reference assembly under the Entrez Gene link	NP_000760	124020	2621	Hs.282409 (10 ESTs)	CYP2C19	10q23.33
2C58P	AL133513.12	no entry	NT_030059.12	no entry	no entry	hold	no entry	no entry	solo exons 1,2,3 between 2C19 and 2C9
2C62P	AL138921.14	no entry	NT_030059.12	no entry	no entry	hold	no entry	no entry	10q24.31 pseudogene 5Mb upstream of 2C8
2C-se1[7]	AC110078.2	no entry	NT_005403.16	no entry	no entry	hold	no entry	no entry	solo exon 7, 2q24.3 = old CYP2C56P
2C-se2[1:2]	AC069020.8	no entry	NT_008583.16	no entry	no entry	hold	no entry	no entry	solo exons 1,2 10q21.3 = old CYP2C61P
2C-se3[1]	AP000084.1	no entry	NT_011512.10	no entry	no entry	hold	no entry	no entry	solo exon 1, 21q21.2 = old CYP2C63P
2C-se4[1]	AF002223.2	no entry	NT_011726.13	no entry	no entry	hold	no entry	no entry	solo exon 1, Xq28 = old CYP2C64P
2D6 2D gene cluster map	see related sequences under the Entrez Gene link	NM_000106	see reference assembly under the Entrez Gene link	NP_000097	124030	2625	Hs.648256 (117 ESTs)	CYP2D6	deleted in genome assembly 22q13.1 Structures 2F9Q
2D7	see sequences under the Unigene link	no entry	no entry	no entry	no entry	hold	Hs.333497 (33 ESTs)	no entry	alt. spliced 2D7 polymorphic full length 22q13.1
2D7P1/2D7P	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2624	no entry	CYP2D7P1	2D cluster at 22q13.2
2D7P2/2D7AP	multiple	no entry	NG_005574	no entry	no entry	2627	no entry	CYP2D7AP	97.4% to 2D7P on a 44kb XbaI frag.
2D8P1/2D8P	multiple	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2628	no entry	CYP2D8P1	87.3% to 2D7P
2D8P2/2D7BP	X58468	no entry	no entry	no entry	no entry	2626	no entry	CYP2D8P2	96.8% to 2D7P on a 44kb XbaI frag. Also called 2D8BP
2E1	see related sequences under the Entrez Gene link	NM_000773	see reference assembly under the Entrez Gene link	NP_000764	124040	2631	Hs.12907 (264 ESTs)	CYP2E1	10q26.3
2F1	see related sequences under the Entrez Gene link	NM_000774	see reference assembly under the Entrez Gene link	NP_000765	124070	2632	Hs. 558318 (7 ESTs)	CYP2F1	19q13.2
2F1P	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	18851	no entry	CYP2F1P	missing N-term
2G1P	see related sequences under the Entrez Gene link, also S80998 S80999	no entry	see reference assembly under the Entrez Gene link	no entry	601133	2633	no entry	CYP2G1P	94% missing exons 4, 5, 6
2G2P	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	15653	no entry	CYP2G2P	in frame stops and frameshifts
2J2 2J gene cluster map	see related sequences under the Entrez Gene link	NM_000775	see reference assembly under the Entrez Gene link	NP_000766	601258	2634	Hs.152096 (177 ESTs)	CYP2J2	1p32.1
2R1	see related sequences under the Entrez Gene link	NM_024514	see reference assembly under the Entrez Gene link	NP_078790	608713	20580	Hs. 371427 (144 ESTs)	CYP2R1	11p15.2
2S1	see related sequences under the Entrez Gene link	NM_030622	see reference assembly under the Entrez Gene link	NP_085125	no entry	15654	Hs.98370 (211 ESTs)	CYP2S1	19q13.2
2T2P	multiple	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	18852	erroneously joined to EGLN2 entry	CYP2T2P	2T1 rat is expressed
2T3P	AC008962	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	18853	no entry	CYP2T3P	2T1 rat is expressed
2U1	see related sequences under the Entrez Gene link	NM_183075	see reference assembly under the Entrez Gene link	NP_898898	610670	20582	Hs.109087 (177 ESTs)	CYP2U1	4q25 synonym P450TEC
2W1	see related sequences under the Entrez Gene link	NM_017781	see reference assembly under the Entrez Gene link	NP_060251	no entry	20243	Hs.272795 (51 ESTs)	54905	7p22.3 NP_seq incomplete
2AB1P	AC068644.15	no entry	NT_005612.15	no entry	no entry	hold	no entry	no entry	3q27.1 = old CYP2D31P, 75% to mouse 2ab1
2AC1P	AC022650.3	no entry	NT_007592.14	no entry	no entry	hold	no entry	no entry	6p12.3 = old CYP2C57P 68% to rat 2AC1 (XM_236969.1)
3A 3A gene cluster map	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2635	no entry	CYP3A cluster	3A subfamily entry
3A3X	multiple	no entry	no entry	no entry	no entry	hold	no entry	CYP3A4	discontinued no. = 3A4
3A4	see related sequences under the Entrez Gene link	NM_017460	see reference assembly under the Entrez Gene link	NP_059488	124010	2637	Hs. 651218 (354 ESTs)	CYP3A4	7q22.1 Structures 2J0D 2J0C 1W0G 1W0F 1W0E 1TQN
3A4-ie1b	multiple	no entry	NT_007933.14	no entry	no entry	hold	no entry	no entry	7q22.1 partial internal exon
3A5_v1	see related sequences under the Entrez Gene link	NM_000777	see reference assembly under the Entrez Gene link	NP_000768	605325	2635	Hs.150276 (214 ESTs)	CYP3A5	7q22.1 = wt CYP3A5
3A5_v2	L26985 see also related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2639	no entry	no entry	CYP3A5_v2 = alt. splice of 3A5, = old 3A5P1, but not a pseudogene
3A5_v3	X90579	no entry	NT_007933.14	no entry	no entry	18850	no entry	no entry	CYP3A5_v3 = alt. splice of 3A5, = old CYP3A5P2, but not a pseudogene
3A5-de13c	multiple	no entry	NT_007933.14	no entry	no entry	hold	no entry	CYP3A5P1 incorrectly named	detritus exon 13 near 3A5 = old CYP3A51P
3A5-de1b2b	AC069294.5	no entry	NT_007933.14	no entry	no entry	hold	no entry	CYP3A5P1 incorrectly named	detritus exons 1,2 near 3A5
3A7	see related sequences under the Entrez Gene link	NM_000765	see reference assembly under the Entrez Gene link	NP_000756	605340	2640	Hs. 111944 (98 ESTs)	CYP3A7	7q22.1
3A7-de1b2b	multiple	no entry	NT_007933.14	no entry	no entry	no entry	CYP3A5P2 incorrectly named	detritus exons 1,2 near 3A7
3A43	see related sequences under the Entrez Gene link	NM_022820	see reference assembly under the Entrez Gene link	NP_073731	606534	17450	Hs.306220 (9 ESTs)	CYP3A43	7q22.1 isoform 1
3A43	see related sequences under the Entrez Gene link	NM_057095	see reference assembly under the Entrez Gene link	NP_476436	606534	17450	Hs.306220 (9 ESTs)	CYP3A43	7q22.1 isoform 2
3A43	see related sequences under the Entrez Gene link	NM_057096	see reference assembly under the Entrez Gene link	NP_476437	606534	17450	Hs.306220 (9 ESTs)	CYP3A43	7q22.1 isoform 3
3A43-de1b	multiple	no entry	NT_007933.14	no entry	no entry	hold	no entry	no entry	detritus exon 1 near 3A43
3A43-de4c6c	multiple	no entry	NT_007933.14	no entry	no entry	hold	no entry	no entry	detritus exons 4,6 near 3A43 = old 3A52P, 3A53P
3A-se1[2]	AC016898.6	no entry	NT_007819.16	no entry	no entry	hold	no entry	no entry	solo exon 2, = old CYP3A54P near CYP2W1
3A-se2[5]	AC004887.2	no entry	NT_007819.16	no entry	no entry	hold	no entry	no entry	solo exon 5, = old CYP3A55P near CYP2W1, 214kb from 3A54P
4A11 4ABXZ gene cluster map	see related sequences under the Entrez Gene link	NM_000778	see reference assembly under the Entrez Gene link	NP_000769	601310	2642	Hs.1645 (46 ESTs)	CYP4A11	1p33
4A20X	no entry	no entry	no entry	no entry	no entry	hold	no entry	no entry	restored to old name 4Z1
4A22	see related sequences under the Entrez Gene link	NM_001010969	see reference assembly under the Entrez Gene link	NP_001010969	no entry	20575	Hs.567807 (19 ESTs)	CYP4A22	1p33 95% identical to 4A11
4A-se1[12]	AL731892.6	no entry	NT_032977.8	no entry	no entry	hold	no entry	no entry	solo exon 12, = old CYP4A26P
4A-se2[1]	AL731892.6	no entry	NT_032977.8	no entry	no entry	hold	no entry	no entry	solo exon 1
4A-se3[12]	AL731892.6	no entry	NT_032977.8	no entry	no entry	hold	no entry	no entry	solo exon 12, = old CYP4A27P
4A-se4[2]	AL731892.6	no entry	NT_032977.8	no entry	no entry	hold	no entry	no entry	solo exon 2
4B1	see related sequences under the Entrez Gene link	NM_000779	see reference assembly under the Entrez Gene link	NP_000770	124075	2644	Hs.436317 (184 ESTs)	CYP4B1	1p33
4F2 4F gene cluster map	see related sequences under the Entrez Gene link	NM_001082	see reference assembly under the Entrez Gene link	NP_001073	604426	2645	Hs.101 (68 ESTs)	CYP4F2	19p13.12
4F2-de12b	AC004791.1	no entry	NT_011295.10	no entry	no entry	hold	no entry	no entry	exon 12 downstream of 4F2 = old CYP4F36P
4F3	see related sequences under the Entrez Gene link	NM_000896	see reference assembly under the Entrez Gene link	NP_000887	601270	2646	Hs.106242 (75 ESTs)	CYP4F3	19p13.12
4F8	see related sequences under the Entrez Gene link	NM_007253	see reference assembly under the Entrez Gene link	NP_009184	no entry	2648	Hs.268554 (36 ESTs)	CYP4F8	19p13.12
4F9P	AC004609.1	no entry	NT_011295.10	no entry	no entry	hold	no entry	no entry	19p13.12 35kb upstream of 4F11
4F10P	AD000685	no entry	NT_011295.10	no entry	no entry	hold	no entry	no entry	19p13.12 between 4F3 and 4F12
4F11	see related sequences under the Entrez Gene link	NM_021187	see reference assembly under the Entrez Gene link	NP_067010	no entry	13265	Hs.187393 (55 ESTs)	CYP4F11	19p13.12
4F12	see related sequences under the Entrez Gene link	NM_023944	see reference assembly under the Entrez Gene link	NP_076433	no entry	18857	Hs.591000 (104 ESTs)	CYP4F12	19p13.12
4F22	see related sequences under the Entrez Gene link	NM_173483	see reference assembly under the Entrez Gene link	NP_775754	no entry	hold	Hs.156452 (12 ESTs)	CYP4F22	19p13.12 Entrez Gene name is incorrectly called CYP2E2
4F23P	multiple	no entry	NT_011295.10	no entry	no entry	hold	no entry	no entry	19p13.12 between 4F22 and 4F8
4F24P	multiple	no entry	NT_011295.10	no entry	no entry	hold	Hs.438274 (14 ESTs)	no entry	19p13.12 between 4F12 and 4F2
4F-se1[6:8]	multiple	no entry	NT_078070.2	no entry	no entry	hold	no entry	no entry	9q13 = old 4F25P, in 3 prime UTR of AK125850, inside PTGES3
4F-se2[6]	multiple	no entry	NT_008413.17	no entry	no entry	hold	no entry	no entry	9p13.3 = old 4F26P
4F-se3[6:7:8]	multiple	no entry	NT_022135.15	no entry	no entry	hold	no entry	no entry	2q21.1 = old 4F27P
4F-se4[6:7:8]	multiple	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2647	no entry	CYP4F-se4[6:7:8]	21q11.2 = old 4F29P synonym CYP4F3LP
4F-se5[6:8]	multiple	no entry	NT_026970.9	no entry	no entry	hold	no entry	no entry	2q11.1 = old CYP4F32P
4F-se6[6]	AL390726.19	no entry	NT_008413.17	no entry	no entry	hold	no entry	no entry	9p13.1 = old CYP4F33P
4F-se7[6:7:8]	AL391382.10	no entry	NT_024524.13	no entry	no entry	hold	no entry	no entry	13q11 = old CYP4F34P
4F-se8[6:7:8]	BC037172.1	no entry	NT_010859.14	no entry	no entry	hold	no entry	no entry	18p11.21 = old CYP4F35P
4F-se9[6:7:8]	AC132479.2	no entry	NT_022135.15	no entry	no entry	hold	no entry	no entry	2q21.1 = old CYP4F30P
4F-se10[6:7:8]	AC131180.3	no entry	NT_022135.15	no entry	no entry	hold	no entry	no entry	2q21.1 = old CYP4F31P
4F-se11[6:7:8]	multiple	no entry	NT_022135.15	no entry	no entry	hold	no entry	no entry	2q21.1 = old CYP4F43P
4F-se12[6:8]	AC134698.10	no entry	NT_007995.14	no entry	no entry	hold	no entry	no entry	8p11.1 = old CYP4F44P
4F-se13[6:8]	multiple	no entry	NT_078043.4	no entry	no entry	hold	no entry	no entry	9p11.2 = old CYP4F45P identical to CYP4F-se1[6:8]
4F-se14[6:8]	multiple	no entry	NT_078055.4	no entry	no entry	hold	no entry	no entry	9p11.2 identical to CYP4F-se1[6:8]
4V2	see related sequences under the Entrez Gene link	NM_207352	see reference assembly under the Entrez Gene link	NP_997235	608614 210370	23198	Hs.237642 (247 ESTs)	CYP4V2	4q35.2 = old 4AH1, Bietti crystalline corneoretinal dystrophy
4X1	see related sequences under the Entrez Gene link	NM_178033.1	see reference assembly under the Entrez Gene link	NP_828847	no entry	20244	Hs.439760 (144 ESTs)	CYP4X1	1p33 not in Build 33
4Z1	see related sequences under the Entrez Gene link	NM_178134	see reference assembly under the Entrez Gene link	NP_835235	no entry	20583	Hs.176588 (44 ESTs)	CYP4Z1	1p33 formerly 4A20
4Z2P	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	hold	Hs.591431 (21 ESTs)	CYP4Z2P	full pseudogene between 4B1, 4A11, 94% to 4Z1
4AH1X	no entry	no entry	no entry	no entry	no entry	hold	no entry	no entry	renamed 4V2
5A1_v1	see related sequences under the Entrez Gene link	NM_001061	see reference assembly under the Entrez Gene link	NP_001052	274180	11609	Hs.520757 (309 ESTs)	CYP5A1, TBXAS1	TBXAS1 thromboxane synthase form-I 7q34
5A1_v2	see related sequences under the Entrez Gene link	NM_030984	see reference assembly under the Entrez Gene link	NP_112246	274180	11609	Hs.520757 (309 ESTs)	CYP5A1, TBXAS1	thromboxane synthase form-II 7q34
7A1	see related sequences under the Entrez Gene link	NM_000780	see reference assembly under the Entrez Gene link	NP_000771	118455	2651	Hs.1644 (17 ESTs)	CYP7A1	8q12.1
7B1	see related sequences under the Entrez Gene link	NM_004820	see reference assembly under the Entrez Gene link	NP_004811	603711	2652	Hs.491869 (98 ESTs)	CYP7B1	8q12.3
8A1	see related sequences under the Entrez Gene link	NM_000961	see reference assembly under the Entrez Gene link	NP_000952	601699	9603	Hs.302085 (96 ESTs)	CYP8A1, PTGIS	prostacyclin synthase 20q13.13 PTGIS Structures 2IAG
8B1	see related sequences under the Entrez Gene link	NM_004391	see reference assembly under the Entrez Gene link	NP_004382	602172	2653	Hs.447793 (36 ESTs)	CYP8B1	3p22.1
11A1	see related sequences under the Entrez Gene link	NM_000781	see reference assembly under the Entrez Gene link	NP_000772	118485	2590	Hs.303980 (367 ESTs)	CYP11A1	15q24.1
11B1	see related sequences under the Entrez Gene link	NM_000497	see reference assembly under the Entrez Gene link	NP_000488	610613 202010 103900	2591	Hs.184927 (138 ESTs)	CYP11B1 isoform 1	8q24.3
11B1	see related sequences under the Entrez Gene link	NM_001026213	see reference assembly under the Entrez Gene link	NP_001021384	610613 202010 103900	2591	Hs.184927 (138 ESTs)	CYP11B1 isoform 2	8q24.3, missing coding exon 8, including the heme signature
11B2	see related sequences under the Entrez Gene link	NM_000498	see reference assembly under the Entrez Gene link	NP_000489	124080 203400 610600 103900	2592	Hs.632054 (2 ESTs)	CYP11B2	8q24.3, Corticosterone Methyloxidase Type I and Type II Deficiency, Glucocorticoid-Remediable Aldosteronism
17A1	see related sequences under the Entrez Gene link	NM_000102	see reference assembly under the Entrez Gene link	NP_000093	609300 202110	2593	Hs.438016 (853 ESTs)	CYP17A1	10q24.32
19A1	see related sequences under the Entrez Gene link	NM_000103	see reference assembly under the Entrez Gene link	NP_000094	107910 139300	2594	Hs.511367 (1631 ESTs)	CYP19A1 form 1	15q21.2, aromatase, hereditary gynecomastia
19A1	see related sequences under the Entrez Gene link	NM_031226	see reference assembly under the Entrez Gene link	NP_112503	107910 139300	2594	Hs.511367 (1631 ESTs)	CYP19A1 form 2	15q21.2, aromatase, hereditary gynecomastia, includes untranslated exon 2a that makes a longer 5 prime UTR
20A1	see related sequences under the Entrez Gene link	NM_177538	see reference assembly under the Entrez Gene link	NP_803882	no entry	20576	Hs.446065 (164 ESTs)	CYP20A1 form 1	2q33.2, full length
20A1	see related sequences under the Entrez Gene link	NM_020674	see reference assembly under the Entrez Gene link	NP_065725	no entry	20576	Hs.446065 (164 ESTs)	CYP20A1 form 2	2q33.2, truncated variant
21A1P	see related sequences under the Entrez Gene link	no entry	see reference assembly under the Entrez Gene link	no entry	no entry	2599	no entry	CYP21A1P	6p21.33 pseudogene
21A2	see related sequences under the Entrez Gene link	NM_000500	see reference assembly under the Entrez Gene link	NP_000491	201910	2600	Hs.534847 (1473 ESTs)	CYP21A2	6p21.33 CYP21
24A1	see related sequences under the Entrez Gene link	NM_000782	see reference assembly under the Entrez Gene link	NP_000773	126065	2602	Hs.89663 (52 ESTs)	CYP24A1	20q13.2
26A1	see related sequences under the Entrez Gene link	NM_000783	see reference assembly under the Entrez Gene link	NP_000774	602239	2603	Hs.150595 (72 ESTs)	CYP26A1 form 1	10q23.33 P450RAI-1, full length
26A1	see related sequences under the Entrez Gene link	NM_057157	see reference assembly under the Entrez Gene link	NP_476498	602239	2603	Hs.150595 (72 ESTs)	CYP26A1 form 2	10q23.33 P450RAI-1, truncated 69 amino acids at N-term
26B1	see related sequences under the Entrez Gene link	NM_019885	see reference assembly under the Entrez Gene link	NP_063938	605207	20581	Hs.91546 (72 ESTs)	CYP26B1	2p13.2 P450RAI-2
26C1	see related sequences under the Entrez Gene link	NM_183374	see reference assembly under the Entrez Gene link	NP_899230	608428	20577	Hs.369993 (7 ESTs)	CYP26C1	10q23.33
27A1	see related sequences under the Entrez Gene link	NM_000784	see reference assembly under the Entrez Gene link	NP_000775	606530 213700	2605	Hs.516700 (396 ESTs)	CYP27A1	2q35
27B1	see related sequences under the Entrez Gene link	NM_000785	see reference assembly under the Entrez Gene link	NP_000776	609506 264700	2606	Hs.524528 (88 ESTs)	CYP27B1	12q14.1
27C1	see related sequences under the Entrez Gene link, and AC027142	NM_001001665, short at N-term	see reference assembly under the Entrez Gene link	NP_001001665, short at N-term	no entry	hold	Hs.407639 (16 ESTs)	CYP27C1	2q14.3 FLJ16008, Entrez Gene seq is short
39A1	see related sequences under the Entrez Gene link	NM_016593	see reference assembly under the Entrez Gene link	NP_057677	605994	17449	Hs.387367 (112 ESTs)	CYP39A1	6p12.3
46A1	see related sequences under the Entrez Gene link	NM_006668	see reference assembly under the Entrez Gene link	NP_006659	604087	2641	Hs.25121 (48 ESTs)	CYP46A1	14q32.2
46A-se1[12:13:14]	AL356289.6	no entry	NT_032977.8	no entry	no entry	hold	no entry	no entry	1p33 12Mb from CYP2J2 = old CYP46A4P
51A1	see related sequences under the Entrez Gene link	NM_000786	see reference assembly under the Entrez Gene link	NP_000777	601637	2649	Hs.417077 (483 ESTs)	CYP51A1	7q21.2
51P1	multiple	no entry	NT_022459.14	no entry	no entry	hold	no entry	no entry	3p12.2
51P2	multiple	no entry	NT_024524.13	no entry	no entry	hold	no entry	no entry	13q12.3
51P3	AL033378	no entry	NT_025741.14	no entry	no entry	hold	no entry	no entry	6q24.3