这个词是什么意思？
An enzyme that catalyses RNA-template-directed extension of the 3'- end of an RNA strand by one nucleotide at a time, and can initiate a chain de novo. (Enzyme Nomenclature, 1992, p293)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012324 · MeSH 2026。
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