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Interleukin 7

Protein
Interleukin 7 is a protein that in humans is encoded by the IL7 gene. IL-7 is a hematopoietic growth factor secreted by stromal cells in the bone marrow and thymus. It is also produced by keratinocytes, dendritic cells, hepatocytes, neurons, and... Wikipedia
Cellular component: extracellular space; extracellular region; collagen-containing extracellular matrix