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Transmission electron microscopic (TEM) images of anther locules in Chinese Spring wheat. a An ultra-thin section of 0.5 mm anther visualized by TEM. EP, epidermis; EN, endodermis; ML, middle layer; T, tapetum; SAC, sporogenous archesporial column. b Central region of the anther showing the transverse section of a SAC. c TEM image of an ultra-thin section of 1.4 mm anther showing disintegrated SAC resulting in dissociation of meiocytes (ME). b, c and d are in different magnification
