NCIt definition : Human CYP3A4*18 allele is located in the vicinity of 7q21.1 and is approximately 27
kb in length. This allele, a variant form of the CYP3A4 wild-type allele, encodes
cytochrome P450 3A4*18 protein. The CYP3A4*18 allele exhibits a clinically-relevant
SNP (g.20070T C) in exon 10 that results in a L293P coding change. This alteration
in protein sequence dramatically increases the enzymatic activity of the cytochrome
P450 3A4*18 protein.;