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The Collaborative International Dictionary of English v.0.48 (gcide)

Myosin \My"o*sin\, n. [Gr. my^s, myo`s a muscle.] (Physiol.
Chem.)
A protein present in muscle, serving as the principle
contractile protein in muscle contraction.

Note: It was earlier considered as being formed in the
process of coagulation which takes place in {rigor
mortis}. See {Muscle plasma}, under {Plasma}.
[1913 Webster PJC]

Note: Myosin belongs to the group of globulins. It is
insoluble in water, but soluble in dilute solution of
salt, and is especially characterized by being
completely precipitated by saturation of its solutions
with salt.
[1913 Webster]