Final answer:
Hematopoietic growth factors regulate blood cell formation through signaling molecules like erythropoietin and interleukins.
Explanation:
Hematopoietic growth factors are chemical signals that regulate the differentiation and proliferation of blood progenitor cells. They include erythropoietin, thrombopoietin, colony-stimulating factors, and interleukins. These factors play a crucial role in hemopoiesis, the process of forming blood cells.
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