<prompt> IL2 is secreted by?NeutrophillsHelper T-cellsMacrophagesNK cells  <response>: Ans. is b i.e., Helper T-cells o IL-2 is secreted by lectin- or antigen-stimulated helper T cellsSelected important cytokinesNameMajor Cellular SourceSelected Biologic EffectsIFN-a, -bLeukocytes IFN-a, fibroblasts IFN-bAntiviral, pyrogenicIFN- interferonT cells, NK cellsActivates mononuclear phagocytesTNF-a tumor necrosis factor alphaMacrophages, NK cellsCell activation, fever, cachexia, antitumorTNF -b tumor necrosis factor beta, LT lymphotoxinT cells, B cellsActivates leukocytes, antitumorIL-1 interleukin - 1Macrophages, epithelial cellsT cell and macrophage activation,fever, cachexiaIL-2 interleukin - 2T cells CD4 Helper T-cellsT cell growth and activationIL-3 interleukin - 3T cells, thymic epithelial cellsHematopoiesisIL-4 interleukin - 4T cells, mast cells, NK cellsB cell proliferation and switching to IgEIL-5 interleukin - 5T cellsDifferentiation of eosinophilsNEETIL-7 interleukin - 7Bone marrow stromal cellsLymphoid progenitor differentiation 