mutantn.突变异种mutantional hotspot突变热点mutant substitution突变体替换mutant core protein变异核壳蛋白mutant haemoglobins血红蛋白突变体, 变种血红蛋白mutant spruce allele突变体云杉等位基因mutant myocilin gene突变型myocilin基因Mutant-enriched PCR突变体富集PCR法Mutants streptococcus变形链球菌mutant identification突变体鉴别mutant selective window突变选择窗