Proteins have diverse biological functions and can serve as components of cellular membranes, cellular catalysts, defensive molecules (antibodies), bacterial toxins and snake venoms, muscle contractile proteins (myosin, actin), and storage proteins.

• 蛋白质有各种生物功能,并且作为细胞膜,细胞催化剂,防御分子(抗体),肌肉收缩蛋白(肌球蛋白,肌动蛋白)和贮存蛋白的组成成分。