NCIt definition : Human CYP2C19*2 allele is located within 10q24.1-q24.3 and is approximately 90 kb
in length. This allele, a variant form of the CYP2C19 wild-type allele, encodes cytochrome
P450 2C19*2 protein. The CYP2C19*2 allele exhibits a clinically-relevant SNP (c.681G
A) in exon 5 that causes a splicing defect; this alteration results in a truncated
cytochrome P450 2C19*2 protein that is enzymatically inactive.;