Interleukin 3 (IL-3) is a cytokine that is produced by activated T cells and mast cells.  IL-3 induces the differentiation of hematopoietic stem cells into myeloid precursor cells, such as erythrocyte, megakaryocyte, granulocyte, monocyte, and dendritic cells.  IL-3 also functions in the nervous system and is important during the B-1 cell regulation of chronic inflammatory diseases.  

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