CYP2C9 and type 2 diabetes mellitus: The analysis of common genetic variants of the CYP2C9 subfamily in type 2 Diabetes mellitus (T2DM) patients in Jeddah showed that the allele frequencies of CYP2C9*2 and CYP2C9*3 were 25% and 9.3%, respectively (personal communication, Nehad Abdulqader Shaer and Ashraf Dallol).