Additional file 2.

Alignments of Sra superfamily proteins. Each panel shows 20 randomly sampled full-length members of one family within the Sra superfamily. Background shading is proportional to the sum-of-pairs alignment score of each residue relative to the aligned column. Approximate positions of predicted transmembrane domains are marked with bars below the alignment. Domains predicted to be extracellular are marked 'OUT' below the alignment. Probable extracellular disulfide bonds are marked above the alignments. In cases where there is more than one potential disulfide bond, the pairs were inferred by covariance in presence among family members (including other proteins not shown).

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Thomas and Robertson BMC Biology 2008 6:42   doi:10.1186/1741-7007-6-42