This protocol defines in general terms the purposes for which blood and bone marrow specimens will be collected by members of the Hematology Branch and the conditions under which the sampling will be performed. Samples of blood and bone marrow from healthy volunteers and from patients are indispensable for many research projects, including studies of normal and abnormal hematopoiesis, the viral etiology of blood diseases, and the role of the immune system in marrow failure and related conditions.
