 Cells that contain this mutant receptor behave as if they are in an environment of high Dpp such as the area near the stripe of cells producing Dpp.By generating small patches of these cells in different parts of the wing tissue, investigators were able to distinguish how Dpp acts to pattern the tissue.If cells that receive a Dpp signal instruct their neighbors in a cascade, then additional tissue patterning centers should appear at the sites of the mutant cells that seem to receive high Dpp signaling but do not produce any Dpp themselves.