Throughout adult life, all blood cells are constantly regenerated from a small pool of hematopoietic stem cells. A single purified stem cell injected into a lethally irradiated host is sufficient to reconstitute all lineages, demonstrating pluripotency and an enormous regenerative potential. Genes encoding secreted growth factors, signal transduction molecules and nuclear proteins regulate this process. The helical cytokine family comprises structurally related secreted proteins that play an important role as hematopoietic gr...
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