During embryonic development, the intestine of the Drosophila fly divides into distinct chambers thanks to the formation of constrictions at specific points of the tissue. The Wingless (Wg) signaling ...

The Drosophila embryo's midgut forms with an endodermal layer (green) encased by visceral mesoderm (blue). Three constrictions divide the gut, with Wingless (magenta) shaping the middle one. "We knew ...