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Inactivation of recombination suppresses the synthetic lethality of mus81 sgs1 and mms4 sgs1 mutants. Tetrads from diploids heterozygous for the three mutations are indicated underneath the figures. The single “rad ” segregant clones are indicated by squares, the sgs1 mus81 and sgs1 mms4 double-mutant clones by circles, and the triple mutants by diamonds.
