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. 1999 Sep 28;96(20):11416–11421. doi: 10.1073/pnas.96.20.11416

Figure 2.

Figure 2

Wild-type and ask1-1 mutant pollen development. (A) Wild-type (Ler) pollen grains. (B) ask1-1 pollen grains, which have degenerated. (C) Uniformly sized wild-type microspores. (D) ask1-1 microspores of variable sizes from the same anther. (E) Wild-type tetrads, showing three of the four spores. (F) ask1-1 tetrads, with the number of spores indicated. All panels have the same magnification. (Bar = 20 μm.) (G) Distribution of spore number in tetrads. More than 100 wild-type and 143 ask1-1 tetrads were examined.