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诱变剂，诱变因素
environ.	mutagen An agent that raises the frequency of mutation above the spontaneous rate. An agent that causes changes to plants and animals, particularly to their genetic material and especially at the time of reproduction. Certain chemicals and forms of radiation are powerful mutagens that damage the DNA, or genetic material in the centre of every cell of a living organism (增加突变频率而高于自发节律的药剂。药剂导致植物和动物特别是其遗传物质的变化，尤其是在繁殖的期间。某些化学物质和辐射诱变形式对DNA或每个生物体细胞中心的遗传物质造成强力突变。)