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Microtubule-stimulated ATPase rates of one-headed kinesin heterodimer and two-headed kinesin homodimer. (a) One-headed kinesin in solution. (b) One-headed kinesin adsorbed to beads at 500 motors/bead. (c) One-headed kinesin adsorbed to beads at 1 motor/bead. (d) Comparison of one-headed heterodimer (filled circles) and two-headed kinesin homodimer (open circles) adsorbed at 1 motor/bead. Note: beads are not drawn to scale.
