Anti-CYP2C9 antibodies are used in the immunodetection of the protein cytochrome P450 family 2 subfamily C member 9. In humans, the canonical protein has a reported length of 490 amino acid residues and a mass of 55.6 kDa. Its subcellular localization is in the ER. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of a the Cytochrome P450 protein family, CYP2C9 is a cytochrome P450 monooxygenase involved in the metabolism of various endogenous substrates, including fatty acids and steroids. Synonyms for this target antigen include CYP2C, CYP2C10, CYPIIC9, P450-2C9, P450IIC9, and CPC9.