Sequence alignment of MJ-CorA and ST-CorA. The two polypeptides were aligned by eye by using the following sets of amino acid similarities (with C and P each having no similar amino acids): G, A, S, and T; I, L, V, and M; H, R, and K; D, E, N, and Q; and F, Y, and W. The three C-terminal transmembrane domains of CorA (13) are underlined. Colons indicate identical amino acids, and periods indicate similar amino acids. S. typh., ST-CorA; M. jann., MJ-CorA.