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Part of the myosin II structure. Atoms in the heavy chain are colored red on the left-hand side, and atoms in the light chains are colored orange and yellow.

Myosins are a group of specialized proteins used for muscle contraction and motion in eukaryotic cells. Myosins need ATP for energy to do these functions. A large number of different myosin genes have been discovered in eukaryotes.

The structure and function of myosin is strongly conserved across species. For example, Rabbit muscle myosin II will bind to actin from an amoeba.[1]


  1. McMahon, T. A. 1984. Muscles, reflexes and locomotion'. Princeton University Press. ISBN 978-0-691-02376-2