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Cross-sections of seed pods in domesticated accessions. The left panel of each accession is a close-up of abscission zone. Phloroglucinol-HCl stains pod sclerenchyma with bright red while it stains abscission zone with dark red. Soybean accessions have brightly-stained sites at the tip of fiber cap cells (arrows), which indicates abscission layer is not completely formed.
