CYP2C19 and dyspepsia: 22 A Turkish population study of patients with dyspepsia revealed that CYP2C19*2 and CYP2C19*3 genotypes were detected in 13% and 1% of patients, respectively.23 The heterozygous mutant CYP2C19*2 G/A allele was detected in 16.6% of patients in our study.