Fig. 7. Ectopic furrows behave like the endogenous furrow. (A,A',D,D') wild type. (B,B',E,E') Egfr[act] expression is controlled by dpp^blk-GAL4. (C,C',F,F') Egfr^tsla. Genotypes listed above each column and protein visualized is noted to the left of each row. (A'-F') Single channels showing localization of Dpp and Wg antigen. (A-F) F-actin (red), detected proteins (green). Arrows in A-C,A'-C' indicate Dpp expression in the furrow. Note that Dpp expression is within cells of the ectopic furrows in B,B'. Arrows in D-F,D'-F' indicate Wg expression. Note that in (E,E') the ectopic furrow has initiated despite the presence of Wg at the margin and in (F,F') Wg expression is seen in the furrow if Egfr signaling is removed.