Figure 2From: Study of the frequency of Clostridium difficile tcdA, tcdB, cdtA and cdtB genes in feces of Calves in south west of Iran Gel electrophoresis for detection of C. difficile (Lane 2 shows fermentas 100Â bp DNA molecular marker, Lanes 1, 4, 5 and 7 are positive samples for C. difficile , and Lanes 3 and 6 are negative for C. difficile ). Back to article page