组成地球上蛋白质的那20个（氨基酸）都是左旋氨基酸。
The twenty that make up the proteins on Earth are all left-handed.
肌肉组织就是由这些不同种类的氨基酸通过同化作用组成的。
Remember, muscle tissue is made from the assimilation of various amino acids.
肌肉组织就是由这些不同种类的氨基酸通过同化作用组成的。
Remember, muscle tissue is made from the assimilation of various amino acids.
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