Fig. 7. The deduced amino acid sequences of the cloned fragments of African lungfish Protopterus annectens (A) Na⁺/HCO ^–₃ cotransporter (NBC) and (B) V-type H⁺-ATPase aligned with corresponding regions of NBC and H⁺ V-ATPase sequences (from GenBank databases) for selected vertebrates. Grey shading indicates amino acid residues that are conserved across all four species, whereas black shading indicates residues that are conserved across three species. lf, lungfish. GenBank protein accession numbers for the sequences used were as follows: (A) NBC: rainbow trout AAN52239, human AAC39840, salamander (Ambystoma tigrinum) AAB61339; (B) H⁺ V-ATPase: rainbow trout AAD33861, human AAH30640, Xenopus AAH46738.