Interleukin-3 promotes the proliferation and differentiation of hematopoietic cells through binding to its receptor. The receptor for IL-3 is a heterodimer with a ligand-specific alpha chain (70 kD, CD123) and a common beta chain (shared with IL-5 and GM-CSF). Signaling is believed to be primarily through Stat5 and the MAPK pathways.
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