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Science  07 Apr 2000:
Vol. 288, Issue 5463, pp. 7e-7
DOI: 10.1126/science.288.5463.7e

When muscles contract or organelles get shipped around cells, protein motors do the heavy lifting. On p. 88, Vale and Milligan review new evidence of the structural similarities shared by two kinds of molecular motorskinesin motors and actin-based myosin motors. The authors have created two animations of these tiny machines that should serve as valuable teaching tools. See www.sciencemag.org/cgi/content/full/288/5463/88

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