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Early seed development in diploid A. lyrata, A. arenosa, and reciprocal hybrids. The microscopy pictures show cleared seeds where the embryo and endosperm nuclei are visible. The directionality of the cross is indicated seed parent (♀) × pollen donor (♂). 2A: 2x A. arenosa; 2L: 2x A. lyrata. (Scale bars, 50 µm.)
