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Sequence alignments of the transmembrane segments of the Na+-NQR subunits B, D and E, against the homologous subunits of RNF.
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Conserved acidic residues are indicated in white on black. The transmembrane segments of each subunit were obtained with the algorithms used previously (15). In cases where a consensus transmembrane helix was not well defined, all possible amino acids were included in the alignment, resulting in some helices appear longer than others.
