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In situ analysis of PISTILLATA expression in flower primordia of Clermontia parviflora. In situ hybridization on flower primordia of C. parviflora displays expression of PI homologs in (A) early stage outer perianth organs and (B and C) in both perianth organs and whorl 3 in a late-stage bud. (D) Sense PI homolog controls show low background staining. Images are displayed at 20× (A), 10× (B and D) and 40× (C). Organs are numbered by whorl; b = bract.
