FIGURE 1

Four variants in CYP genes (CYP2C9*2, CYP2C9*3, CYP2C19*2, and CYP2C19*3) that show different allele frequencies among various ethnic groups. For each variant, its frequencies in the African-American (Af), Asian (As)/Chinese (Ch), and Caucasian (Ca) populations are shown. The nomenclature for a CYP variant is the gene name followed by the allele, which is indicated by an asterisk; for example, CYP2C9*2 is the *2 allele in the CYP2C9 gene. The frequencies for these variants and additional variants can be found in the article by Xie et al. ⁴