This fellowship is offered jointly by the Transfusion Medicine Division and Hemapheresis and Transfusion Support (HATS) of The Johns Hopkins Hospital Department of Pathology, with rotations at the American Red Cross blood services headquarters in Baltimore, the Immunogenetics Laboratory of the Johns Hopkins Department of Medicine and the Cellular Therapy Laboratory of the Johns Hopkins Sidney Kimmel Comprehensive Cancer Center. A clinically oriented research project is an integral part of the first year and may be continued during the optional second year. The second year prepares the fellow for an investigative career in transfusion medicine.