It may be synthesized directly from ammonia, carbon dioxide, and a donated methyl group; derived from serine; or derived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。
Transamination is a key step in the biosynthesis and breakdown of most amino acids.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。