In 1980 at the University of Cambridge’s department of pathology, I worked with Herman Waldmann to develop monoclonal antibodies (MAbs) as treatments for graft-versus-host disease (GVHD). That disease is associated with serious complications of stem cell transplantation when attacking T-cells can damage the lungs, liver, skin, and other organs. If we could find a specific MAb that would work with the human complement system to kill those cells, they could be selectively removed from the bone marrow. The human complement…