 He is interested in the function of Hedgehog proteins and other extracellular signals in morphogenesis (pattern formation) and in injury repair and regeneration (pattern maintenance), in particular the normal roles of such signals in stem cell physiology and their abnormal roles in the formation and expansion of cancer stem cells.He is also interested in how the distribution of such signals is regulated in tissues, how cells perceive and respond to distinct concentrations of signals, and how such signaling pathways arose in evolution.Beachy's research focuses on understanding the molecular mechanisms behind the growth of multicellular embryos, especially the role of the Hedgehog signaling pathway.