Fig. 6. Pattern of DR5::GUS expression in developing leaves of wild type (A-D,I,K) and fkd1 (E-F,J,L) upon no exposure (A-H) or exposure (I-L) to auxin transport inhibition. Leaves were taken at 4 DAG (A,B,E,F), 5 DAG (C,G,I,J) and 6 DAG (D,H,K,L). Arrows indicate reduced reporter gene expression at distal joints of wild-type secondary veins. Scale bar: 100 µm.