IL-21
Encyclopedia
IL-21 or IL 21 can refer to:
- Interleukin 21Interleukin 21Interleukin-21 is a protein that in humans is encoded by the IL21 gene.Interleukin 21 is a cytokine that has potent regulatory effects on cells of the immune system, including natural killer cells and cytotoxic T cells that can destroy virally infected or cancerous cells...
- Illinois' 21st congressional district, an obsolete district
- Illinois Route 21Illinois Route 21Illinois Route 21 is an arterial north–south state highway in northeastern Illinois. It runs from Illinois Route 43 in Niles to U.S. Route 41 north of Gurnee. Illinois 21 is 28.13 miles long....