A number of ELISA Kits are available that target 21OH, an alias of the protein, cytochrome P450 family 21 subfamily A member 2. The human protein, encoded by the gene CYP21A2, is a member of the Cytochrome P450 family. Additional synonyms or past names for this protein may include: CA21H|CAH1|CPS1|CYP21|CYP21B|P450c21B. Homology is conserved in other species, such as Mouse.