NCIt definition : Human CYP2D6*4 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*4 protein. The CYP2D6*4 allele exhibits a clinically-relevant
SNP (g.1846G A) at the consensus sequence of the splice site of intron 3 that results
in a premature stop codon. This alteration yields a truncated cytochrome P450 2D6*4
protein that is enzymatically inactive.;