fringe, a Boundary-specific signaling molecule, mediates interactions between dorsal and ventral cells during Drosophila wing development.

Abstract excerpt

Wing formation in Drosophila requires interactions between dorsal and ventral cells. We describe a new gene, fringe, which is expressed in dorsal cells and encodes for a novel protein that is predicted to be secreted. Wing margin formation and distal wing outgrowth can be induced by the juxtaposition of cells with and without fringe expression, whether at the normal wing margin, at the boundaries of fringe mutant...

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