Abstract

Rabbit muscular globulins soluble between the ionic strengths 0.15 and 0.35 are, in an almost native state, theα andβ myosins ofDubuisson. The extractability of both,α andβ, by salt solutions is greatly reduced when the rabbit muscle has been stimulated to exhaustion or poisoned with the sodium salt of monobromacetic acid till a state of rigor is obtained. This reduction however does not proceed in an absolutely similar way forα andβ, indicating probable functional differences between these two myosins. The other soluble muscular proteins are practically not affected, as far as the method permits this to be assertained.

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