胶原蛋白

胶原蛋白是各种结缔组织（包括皮肤、骨骼、肌腱和软骨）细胞外基质中的主要结构蛋白。它是哺乳动物中含量最丰富的蛋白质，约占全身蛋白质总量的25%至35%。牛跟腱来源的胶原蛋白常用于研究、组织工程和化妆品领域。

Collagen is the main structural protein in the extracellular matrix of various connective tissues, including skin, bone, tendon, and cartilage. It is the most abundant protein in mammals, making up about 25% to 35% of the whole-body protein content. Collagen from bovine Achilles tendon is commonly used in research, tissue engineering, and cosmetic applications.