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The development of female gametophyte in Phaseolus vulgaris in normal conditions (a,b) and treated with nCeO2 (c–g). Accumulation of starch granules inside the embryo sac and maternal tissues is observed after exposure to nCeO2 (c,g). Apoptosis and fragmentation in nuclei and cytoplasm are also considered important changes in female gametophytes after exposure to nCeO2 (d–f).
