NCIt definition : Human CYP2D6*42 allele is located in the vicinity of 22q13.1 and is approximately
4 kb in length. This allele, a variant form of the CYP2D6 wild-type allele, encodes
cytochrome P450 2D6*42 protein. The CYP2D6*42 allele exhibits a two nucleotide insertion
(g.3259insGT) that results in a frameshift during protein coding. This alteration
abolishes the enzymatic activity of the cytochrome P450 2D6*42 protein.;