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Cytokine receptor signaling plays an essential role in the early stages of lymphocyte development. Sials through various cytokine receptors — such as c-kit, flt3/flk2, CXCR4, the IL-7 receptor and the IL-15 receptor — are known to promote the expansion and survival of uncommitted progenitor cells as well as their migration to the appropriate microenvironment and subsequent differentiation into B,...