Fig. 3From: Assessing S. mansoni prevalence in Biomphalaria snails in the Gombe ecosystem of western Tanzania: the importance of DNA sequence data for clarifying species identificationGel electrophoresis of PCR products of snail DNA with multiple bands. In Lane 8 (H124), the bands for the species detected are indicated by numbers: 1, size predicted for S. mansoni (500 bp); 2, size predicted for snails (600 bp); 3, amplification products of an unknown trematode (1000 bp). Also indicated are a positive control (+ve H19), a negative extraction control (−VE EXT) and a negative PCR control (−VE PCR) Back to article page