这个词是什么意思？
Enzymes that catalyze DNA template-directed extension of the 3'-end of an RNA strand one nucleotide at a time. They can initiate a chain de novo. In eukaryotes, three forms of the enzyme have been distinguished on the basis of sensitivity to alpha-amanitin, and the type of RNA synthesized. (From Enzyme Nomenclature, 1992).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012321 · MeSH 2026。
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