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Mature pollen tetrad phenotype after DAPI staining. (A) Tetrad from +/tio-3;qrt1/qrt1 plant showing 2:2 segregation of wild type and tio mutant pollen. (B) Tetrad from a transformant containing MSP1-TIO in the +/tio-3;qrt1/qrt1 background, showing three pollen grains with a wild type phenotype and a single mutant tio pollen grain.
