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What is Interleukin secreted by macrophages, stimulating lymphocytes is: and explain in detail?
Macrophages release IL-1 which stimulates the T-helper cells.
The T-cells in response proliferate and release IL-2 which in turn stimulates still further T-cell proliferation and B cell proliferation and differentiation into plasma cells.

Thus

Macrophages release→IL-1*
T-helper cells release→ IL-2*