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RNA in situ hybridization of consecutive longitudinal sections of an inflorescence apex probed with cyclin D1. Sections were probed with digoxigenin-labeled antisense RNA (A) and sense (B) probes and viewed under bright-field optics, which gives a purple-blue color. The cell walls, revealed by epifluorescence, appear light blue. i, Inflorescence meristem; b, bracts; f, floral meristems.
