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Embryological study of the ovules after open pollination. (A) Mature female gametophyte on the 4th day, with egg cell (eg) and synergid (sc) and degenerating polar nucleus. (B) The zygote (z) on the 8th day. (C,D) Mitosis (arrowheads) in zygotes on the 12th (C) and 16th (D) days. Scale bar = 10 µm.
