Park, Hyokeun; Ramamurthy, Bhagavathi; Safer, Dan; Travaglia, Mirko; Chen, Li-Qiong; Franzini-Armstrong, Clara; Selvin, Paul R.; Sweeney, H. Lee Article Myosin VI steps via a hand-over-hand mechanism with its lever arm undergoing fluctuations when attached to actin Journal of Biological...