Describes research technology for the growth and differentiation of all 12 types of the primary hematopoietic cells that develop into the various types of blood cells. Also provides background information, discusses current and future clinical applications of large-scale culture methods, and considers regulatory and ethical implications associated with using human and fetal tissues. The 13 studies include treatments of hematopoietic stem and progenitor cells, monocytes and macrophages, isolating and culturing human dendritic cells, purifying and culturing erythroid progenitor cells, the development of megakaryocytes and platelets, the mature polyclonal and antigen- specific cell expansion of T-lymphocytes, and T- lymphopoiesis. They are not indexed.