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Differential expression levels of known miRNAs in broccoli uninucleate microspores, binucleate pollen grains and trinucleate pollen grains. ** indicated the significantly differential expression level with corrected P < 0.01; * indicated the significantly differential expression level with corrected P < 0.05. phase-1, phase-2, and phase-3 indicated uninucleate microspores, binucleate pollen grains and trinucleate pollen grains, respectively.
