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Frequency of wild-type and mutant phenotypes during pollen development in gum1 and mud1. The frequencies of wild-type and mutant phenotypes at the bicellular (−4), bicellular/PMII (−3), early tricellular (−2), late tricellular (−1), and mature pollen (+1) stages are presented for gum1 and mud1. More than 400 spores were counted at each stage.
