这个词是什么意思？
An enzyme that catalyzes the reduction of aspartic beta-semialdehyde to homoserine, which is the branch point in biosynthesis of methionine, lysine, threonine and leucine from aspartic acid. EC 1.1.1.3.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D006715 · MeSH 2026。
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