Vertex Pharmaceuticals Is Acquiring Semma Therapeutics Vertex Pharmaceutical (VRTX) entered into a definitive agreement to buy a private company, Semma Therapeutics. Semma uses stem cell-derived human islets as a potential cure for type 1 diabetes. Semma’s major scientific advances include: an ability to produce large quantities of functional human pancreatic beta cells that could . . . This content is for paid subscribers. Please click here to subscribe …