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Plots of transcriptome sizes at different stages of male gametophyte development based on studies using Arabidopsis ATH1 (a) or rice 57 K (b) microarrays. UNM, uninucleate microspores; BCP, bicellular pollen; TCP, tricellular pollen; MPG, mature pollen; GPG, germinating pollen; 4-h PT, 4-h in vitro-grown pollen tubes, SIV-PT, semi-in vivo pollen tubes. SC, purified sperm cells
