Histidine:
Histidine (abbreviated as His or H) is an α-amino acid with an imidazole functional group.
en.wikipedia.org
組氨酸:
组氨酸（Histidine，簡寫為His或H）是存在于蛋白质之中最普遍的20种氨基酸之一。
zh.wikipedia.org
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Histidine組氨酸