EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
A molecular model of an actin filament segment (multi-colored) attached to three myosin heads (tan). During muscular contraction, the myosin heads will climb along the actin filament, shifting the actin filament's position. When myosin binds to ATP, the actin-myosin bond is destabilized and both filaments detach and return to their original positions.
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