... labels a, b, and c are PCR-DGGE banding patterns of 16S rRNA gene in test systems A, B, and C, respectively; d, e, and f are PCR-DGGE banding patterns of C12O gene in test systems A, B, and C, respectively; ... C, respectively; and g, h, and i are PCR-DGGE banding patterns of C23O gene in test systems A, B, and C, respectively. PCR products of C12O gene in test system C at the 1st and 2nd cycles were ... system A and B is for test system B. Numbers represent the cycle number. Only clearly detected bands in PCR-DGGE banding patterns of test systems A and B in Fig. 3 were selected for analysis. ...