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Colony red-sectoring phenotype for a wild-type yeast strain (YSM+) and three ysm mutants. The level of red sectoring reflects the loss rate of an ADE2-marked YAC. Mutants ysm83 and ysm84 display much greater red sectoring (i.e., YAC loss) than the wild-type strain, whereas ysm130 displays slightly more red sectoring than the wild-type strain.
