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During Drosophila eye development, localized Notch signaling at the dorsal ventral (DV)-midline promotes growth of the entire eye field. This long-range action of Notch signaling may be mediated through the diffusible ligand of the Jak/STAT pathway, Unpaired (Upd), which was recently identified as a downstream target of Notch. However, Notch activity has not been shown to be cell-autonomously required...
Planar cell polarity is established in the Drosophila eye through distinct fate specification of photoreceptors R3 and R4 by a two-tiered mechanism employing Fz and Notch signaling: Fz signaling specifies R3 and induces Dl to activate Notch in R4. We show that the atypical cadherin Flamingo (Fmi) plays critical, but distinct, roles in both R3 and R4. Fmi is first enriched at equatorial cell borders...
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