以单体、球型肌动蛋白的形式出现，为一种球状蛋白质；在活体细胞内以聚合物、丝肌动蛋白的形式出现，像两串彼此缠绕拧成一条细丝的珠子。

It occurs as a monomer, G-actin, a globular protein, and in living cells as a polymer, F-actin, which resembles two strings of beads twisted around each other into thin filaments.

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这些球状的蛋白质中最为重要的是一个相对较小的叫做脂质转运蛋白1，还有一种较大的叫做Z23，它们比洗发水里的表面活性剂离子化程度要小并且也少得多。

Those globular proteins, most importantly a relatively small one called lipid transfer protein 1 and a larger one called Z23, are less ionizable and less plentiful than the surfactants in shampoo.

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