突变频率下降 mutation frequency decline (Witkin 1956) 突变起始 mutation initiation 突变率差别对偶基因;对偶基因具有同样遗传能力而突变率不同者 mutation isoallele (Lefevre 1955) ..
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MethodsGene forward mutation method and micronuclei formation test were used to test the effects on the initiation of carcinogenesis;
方法用基因正向突变和周期阻断法微核实验作为启动阶段指标;
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