The results of PCR-RFLP analysis for 4 polymorphisms in exon 4 of CYP2C9 gene. (A) The results of detection of 608TTG>GTG are shown, the wild type (TTG) is completely digested to 199-bp fragment (lanes 2-7) by TaqI. (B) The results of detection of 561CAG>CCG are shown, the wild type (CAG) is completely digested to 153-bp fragment by AluI (lanes 2-7). (C) The results of detection of 537CAT>CCT are shown, the wild type (CAT) is completely digested to 130-bp fragment by NlaIII (lanes 2-7). (D) The results of detection of 527ATT>CTT are shown, the wild type (ATT) is completely digested to 114-bp and 102-bp fragments by NlaIV (lanes 2-7). M indicates 100-bp ladder marker; and lane 1, uncut control.