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Sequence alignment of the last intracellular loop of type IIa and type IIb NaPi cotransporters. From each type II NaPi cotransporters, two species are shown: mouse and human. Conserved amino acids are shown in black and nonconserved in white. The two charged amino acids KR present in type IIa are replaced by uncharged residues NI in type IIb. Potential protein kinase C phosphorylation sites (consensus, S/TXK/R) are also indicated.
