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Fig. 7. csn4null and csn5null mutants are hypersensitive to MMS. First instar larvae of csn4null, csn5null, and their respective heterozygotic siblings were fed with yeast extract supplemented with methyl methane sulfonate (MMS). After treatment, the larvae were observed for viability. Viability=(xM/tM)/(xc/tc)x100, where xM is the number of living MMS-treated individuals, tM is the total number of MMS-treated individuals (including dead individuals), xc is the number of living non-treated individuals and tc is the total number of non-treated individuals for each strain. Starting numbers were 180 larvae for each strain.