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Subclasses of (A) wild-type, (B) 6IQ+2Ala, and (C) 8IQ molecules bound 11, 13, and 15 actin subunits apart. (Upper) Straight lead levers in prepowerstroke conformation. (Lower) Curved lead levers, some attached to a motor in postpowerstroke conformation (asterisks). (Scale bar, 50 nm.)
