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Fig. 6. Analysis of ARF and IAA promoter activity in Arabidopsis flowers. PARF1::GUS (A-C) and PARF2::GUS (D-F) activity in flower bunches (A,D), stage 13 flowers (B, E) and stage 17 flowers (C, F). PIAA3::GUS (G-L) and PIAA7::GUS (M-R) activity in stage 13 flowers (G,I,K,M,O,P) and stage 17 flowers (H,J,L,N,P,R) in wild-type (G,H,M,N), arf1-4 (I,J,O,P) and arf1-4 arf2-8 (K,L,Q,R) plants. (S) Northern blot analysis of IAA gene mRNA in seedlings and flowers. Seedlings were treated for 2 hours with 1 µM IAA or with a mock control.