fig2

Figure 2. Agarose gel stained with ethidium bromide showing PCR products following amplification of ITS region of 10 snails. Lanes: 1: Quick-Load 100 bp DNA Ladder; 2, 4, 6, and 12: B. truncatus; 8, 10, and 14: Physa; 9 and 16: B. globosus; 13: could not be resolved; 18: B. globosus (positive control); 19: no DNA (negative control). PCR: Polymerase chain reaction; ITS: internal transcribed spacer.