ABSTRACT CYP 2A6 is a human enzyme that metabolizes many xenobiotics including coumarin, indole, nicotine and carcinogenic nitrosamines. The gene for CYP2A6 is polymorphic. There are few data available to clarify the relationship between P450 genetic variants and the metabolism of materials in food. The CYP 2A6 wild-type protein and 13 mutants (CYP2A6. 1, CYP2A6. 2, CYP2A6. 5, CYP2A6. 6, CYP2A6. 7, CYP2A6. 8, ...