Fig. 4From: Assessing S. mansoni prevalence in Biomphalaria snails in the Gombe ecosystem of western Tanzania: the importance of DNA sequence data for clarifying species identificationAlignment of sequences of PCR products amplified from the Gombe region to references available in GenBank for snails (a) and S. mansoni-like (b) sequences. Polymorphic positions are indicated (highlighted in grey), numbered from the start of the Gombe sequences (indicated in bold and italics) in each case. The size of the Gombe products are shown in the sequence name. Reference sequences are labelled according to GenBank accession numbers, along with species names and isolates if specified. Note that the B. smithi-like sequence differed from the B. pfeifferi sequences in indels (indicated by a dash), as well as nucleotide substitutions. There were also some indels in GenBank sequences designated as B. pfeifferi and B. stanleyi Back to article page