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Transmission electron micrographs of tomato pedicel and localization of polygalacturonase (PG) in abscission zone cells with immunogold labeling (0 h). (a) and (b): cortex; (c) and (d): central parenchymatous region; (e): vacuole; (f): cell nucleus; (b) and (d) are enlarged photos for the rectangles region in (a) and (c), respectively.
