目的阐明手性和药物手性的概念及其研究的实际意义。
Objective: Expound chirality with chiral drugs concept and actual meaning of research.
比如说，几乎所有构成生物蛋白的氨基酸都是左手性的，所以出现右手手性的自我复制生物分子可能意味着发现了外星生物体。
Almost all amino acids that make up biological proteins, for instance, are left-handed, so a self-replicating biological molecule of right-handed chirality could be suggestive of an alien organism.
“许多药物分子是手性的，并且两种镜象结构在药理上（pharmalogically）有所区别，对人体的作用是不同的”，科恩说。
"Many drug molecules are chiral and the two mirror images are pharmalogically different and do not have same interactions with the body," says Cohen.
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