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Superposition of the structures of individual polypeptides of unliganded (Eo) and BMP-liganded (Ec) MtOMPDC, showing the movement (within the box; in the direction of the arrow) of the “mobile” domain (red α-helices and blue β-strands) toward the “fixed” domain (magenta α-helices and green β-strands). The ordered active site loop is colored yellow in the BMP-liganded structure.
