1. the commonest protein in muscle; a globulin that combines with actin to form actomyosin. 
   在肌肉细胞中最普通的蛋白质，与肌动朊结合形成肌动球朊。
2. a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions. 
   肌肉纤维的蛋白联合体，由球蛋白和肌动朊构成，受刺激变短，从而造成肌肉收缩。
3. Any of the ultramicroscopic filaments, made up of actin and myosin, that are the structural units of a myofibril. 
   肌丝一种极微小的细丝，由肌动朊和肌球蛋白组成，是肌原纤维的结构单位
4. The system of actin and myosin that, with other substances, constitutes muscle fiber and is responsible for muscular contraction. 
   肌动球蛋白由肌动朊与球蛋白组成的系统，并与其他物质一起再组成肌肉纤维并导致肌肉收缩
5. The commonest protein in muscle cells, responsible for the elastic and contractile properties of muscle. It combines with actin to form actomyosin. 
   肌球蛋白在肌肉细胞中最普通的蛋白质，对肌肉的弹性和收缩性的特性很重要，它与肌动朊结合形成肌动球朊

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