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A cytokine (B-cell stimulating factor, BSF-1, 129 aa), produced by a subset of activated T cells (Th2), that promotes the proliferation and differentiation of activated B cells, the expression of MHC class 2 antigens, and low-affinity IgE receptors in resting B cells. The receptor has a common subunit with the IL-2 receptor. Species specific—the human form is ineffective in mouse systems and vice versa.

Subjects: Medicine and Health — Chemistry.

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