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蛋白質是我們的細胞正常運作所需的大分子。它們由氨基酸組成。我們身體的結構和功能取決於蛋白質。沒有它們,身體細胞、組織和器官的調節就無法進行。
肌肉、皮膚、骨骼和人體的其他部位含有大量的蛋白質,包括酶、激素和抗體。
蛋白質也起神經遞質的作用。血紅蛋白是血液中氧氣的載體,是一種蛋白質。