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Microscopic analysis of individual pollen phenotypes evaluated in N. tabacum mature pollen grains. Aborted pollen is indicated in bright field (a) and fluorescence images after DAPI-staining (b) by empty arrows. Young bicellular pollen is indicated by filled arrows. Mature and late bicellular pollen grains with vegetative and generative nuclei visible under UV-light after fluorescence-DAPI staining are indicated on panel (b) by doubled arrows.
