Interleukin-7 (IL-7): The "Lifeline" for Lymphocyte Development and Homeostasis
Interleukin-7 (IL-7) is a pivotal cytokine in the immune system that regulates lymphocyte production, homeostasis, and survival. Unlike IL-2, which primarily activates effector functions, or IL-4, which drives specific differentiation, the core role of IL-7 lies in providing continuous survival signals for T cells and B cells, serving as the "fundamental life-support factor" for maintaining the size and diversity of the adaptive immune cell repertoire.
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