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Il-4 --> interleukin-4

(Science: cytokine) a soluble cytokine factor produced by activated t-lymphocytes that promotes antibody production by causing proliferation and differentiation of b-cells.

Interleukin-4 induces the expression of class ii major histocompatibility complex and fc receptors on b-cells. It also acts on t-lymphocytes, mast cell lines, and several other haematopoietic lineage cells including granulocyte, megakaryocyte, and erythroid precursors, as well as macrophages.

Acronym: il-4