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Immunolocalization of expansin and XTH epitopes in the AZs of –1 DPA to yellowing unpollinated flower pedicels. Unsuccessful pollination led to flower abscission. Longitudinal sections of –1 DPA flower pedicels, including the AZ, were stained with the anti-expansin and anti-xyloglucan antibodies. Micrographs show the negative control without the first antibody step. Arrowheads indicate the AZs. Bar = 0.2 mm.
