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Seed abortion phenotype in the AtHSBP-knockout line (Athsbp-1). (A) Flower positions from 1 to 10 as indicated. (B) Semi-thin sections of the ovary of the wild type (WT) and Athsbp-1 at flower position 3 were stained by toluidine blue O. (C) Seed abortion in green siliques at flower positions 6, 8 and 10. Arrowheads indicate aborted seeds.
