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dna2 mutants are rescued by DNA checkpoint mutations. (A) Strains YDF92 (mec1–1), YDF94 (dna2–22 mec1–1), YDF96 (rad9), YDF98 (dna2–22 rad9), YDF100 (WT), and YDF102 (dna2–22) were streaked on YPD plates containing 1 M sorbitol at 37°C for 3 d before photographing. (B) Strain 2–71 (dna2–20) was mated to strains YDF100 (WT), YDF92 (mec1–1), and YDF96 (rad9). After sporulation of diploids, tetrads were dissected on YPD. Plates were incubated at 30°C for 3 d before photographing.
