这个词是什么意思？
The genetic unit consisting of three structural genes, an operator and a regulatory gene. The regulatory gene controls the synthesis of the three structural genes: BETA-GALACTOSIDASE and beta-galactoside permease (involved with the metabolism of lactose), and beta-thiogalactoside acetyltransferase.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007763 · MeSH 2026。
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