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Fig. 2. Egfr signaling is sufficient to induce furrow initiation. (A) Diagram of dppblk-GAL4 expression. (B-P) Expressed proteins as shown in each panel. Arrows show ectopic furrows, arrowheads indicate furrow inhibition. Anterior is towards the right; F-actin is in red; Elav in green. (F,N) Dorsal and ventral furrows nearly fill the entire eye.