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Fig. 5. Notch is essential for furrow initiation. Arrows show ectopic furrows, arrowheads indicate furrow inhibition. Anterior is towards the right; F-actin is in red; Elav in green. (A) Wild type, asterisk shows furrow. (B-H) Expression of proteins named in each panel controlled by dppblk-GAL4. (B-D,G-H) Only reincarnation affected. (E) Ectopic furrow; this is the only E(spl)C protein that affects furrow initiation.