Phylogram constructed using the neighbor joining method to compare the relationship between the open reading frames of Ov- AQPs of Opisthorchis viverrini and homologues within the aquaporin superfamily . The accession numbers for sequences included in the phylogenetic analysis are shown in each operational taxonomy unit. The numbers above the branches refer to bootstrap values (where greater than 50% support was obtained). Note the separate branches for strict aquaporins and aquaglyceroporins. The novel O. viverrini aquaporins belong to the latter assemblage, indicating that they can transport additional permants beyond water.