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Fig. 8. Expression of DEF (A-C), AP3 (D) and PI (E,F) mRNAs in Arabidopsis inflorescences and flowers doubly transgenic for the AFI::DEF/GLO (A-E) and FDH::AP3/PI (F) transgenes. (A-C) Epidermal expression of the AFI::DEF transgene in differentiating organs of very young (A) and older (B,C) flowers. Bars, 100 µm. (C-F) The region encompassing the first and second whorl organs of older AFI::DEF/GLO (C-E) and FDH::AP3/PI flowers (F) shown at higher magnification. Bars, 200 µm. Endogenous epidermal AP3 (D) and PI (E) expression is not detectable in AFI::DEF/GLO first whorl organs and PI mRNA is not found in sub-epidermal cells in first whorl organs in FDH::AP3/PI flowers (F). Sections were viewed under bright-field illumination. Numbers indicate the whorl.