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Predicted membrane topology and structure of the Psn23 MatE transporter. (A) Twelve putative transmembrane (TM) domains were predicted for Psn23 MatE, on the basis of amino acid hydrophobicity; (B) Ribbon three-dimensional (3D) model of Psn23 MatE, viewed parallel to the membrane (left) and along the membrane normal from the periplasmic side (right), with the twelve TM helices numbered starting from the first N amino acid (methionine).
