The present invention provides a method of detecting a polymorph of the human cytochrome P450 2D6 gene which comprises detecting the occurrence, in exon 9 of the human cytochrome P450 2D6 (CYP2D6) gene, of an insertion of a repetition of the 9 bases TCACCCGTG. According to the method of the present invention, it is possible to detect a novel CYP2D6 polymorph that has not yet been reported. <IMAGE>
METHOD OF DETECTING HUMAN CYTOCHROME P4502D6 GENE POLYMORPHISM