NCIt definition : Human CYP2C9*1 allele is located within 10q24 and is approximately 33 kb in length.
This allele, a variant form of the CYP2C9 wild-type allele, encodes cytochrome P450
2C9*1 protein. There are multiple haplotypes of this allele. The nucleotide sequence
of CYP2C9*1A is identical to that of the wild-type allele and exhibits no mutations.
Three other haplotypes of this allele exhibit a deletion (g.-2665delTG) and/or a SNP
(g.-1188T C) in the 5'- flanking region upstream of the gene. However, these nucleotide
changes have no effect on the enzymatic activity of the corresponding cytochrome P450
2C9*1 protein.;