短語詞組短語base pair substitution mutagens 堿基置換型致突變物base material substitution 材料代用base -pair substitution 堿基置換;堿基替換;對置換base substitution rates 堿基替換速率Base Substitution Mutagenesis 堿基替換誘變single base substitution 也稱作單堿基替換rotationnal base substitution 堿基旋轉(zhuǎn)置換Base substitution mutation 堿基置換突變a base substitution rate 堿基替換率 返回 base substitution