Decapentaplegic (Dpp) is a key morphogen involved in the development of the fruit fly Drosophila melanogaster. It is known to be necessary for the correct patterning of the fifteen imaginal discs, which are tissues that will become limbs and other organs and structures in the adult fly. It has also been suggested that Dpp plays a role in regulatin... Found on http://en.wikipedia.org/wiki/Decapentaplegic