This book gives an update on the inhibitory mechanisms involved in the various steps of hematopoietic stem cell proliferation and differentiation. The authors report the latest research advances, factors that control the cell cycle, receptors function, molecular approaches, the in vivo and in vitro effects of several inhibitors, the inhibition of hematopoiesis by viruses, protecting the bone marrow. The book contains the latest results published by the best international specialists and will be fascinating reading for all those interested in this subject.