以下为句子列表：
英文: It may be synthesized directly from ammonia, carbon dioxide, and a donated methyl group; derived from serine; or derived from glycerate 3-phosphate by TRANSAMINATION of glyoxylate.
中文: 甘氨酸来源于丝氨酸，或由乙醛酸经转氨作用生成的甘油3-磷酸转化而成。
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英文: Transamination is a key step in the biosynthesis and breakdown of most amino acids.
中文: 转氨作用是大多数氨基酸生物合成或降解中的关键反应步骤。
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