Interleukin-4, abreviated IL-4, is a lymphokine that stimulates the proliferation of activated B-cells and T-cells, among other effects. B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... T cells are a subset of lymphocytes that play a large role in the immune response. ...

External links

• Recominant Human Interleukin-4 from Cornell University (http://arginine.chem.cornell.edu/Structures/IL4.html)
• Interleukin-4 from Allergy Glossary (http://www.hon.ch/Library/Theme/Allergy/Glossary/il4.html)