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[Sarcoplasmic actin in muscle cells of ambulacral tubes of the sea star].

Protein solubilized in large quantities in solutions of low ionic strength, when myofibril-like preparations were isolated from ambulacral tube, was shown to be actin. When gelation of sarcoplasmic proteins occurs a gel consisting of actin microfilaments bundles is formed. The factor which inhibits actin polymerization is liberated during gel formation. The aggregate substance of sarcoplasmic actin under cell ionic conditions may be determined by binding with this factor.