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Expression of ABCB1 based on genotypes. The mRNA expression of ABCB1 in mutant homozygotes of G2677T (a) and C3435T (b) was compared to the wild-type homozygotes and heterozygotes in both whole study population (ALL) and the European Americans (Euro-Am). Values are expressed as means ± SEM, *P < 0.05, and **P < 0.01.
