以下为句子列表：
英文: Histidine A basic amino acid formed only rarely in proteins. It is formed from ATP and 5-phosphoribosyl pyrophosphate in a complex biosynthetic pathway. Glutamate is an intermediate in its breakdown.
中文: 组氨酸：是蛋白质中少有的一种碱性氨基酸。由ATP和5-磷酸核糖基焦磷酸盐通过复杂的生物合成途径合成。在其降解过程中可形成谷氨酸。
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英文: L-Arginine is a conditionally essential basic amino acid primarily involved in urea metabolism and excretion as well as DNA synthesis.
中文: 精氨酸是一种基础氨基酸，有助于尿素的新陈代谢和排泄。
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