Synonyms:CD126, gp80, IL 6 receptor subunit alpha, IL 6R 1, IL 6R alpha, IL 6R subunit alpha, IL 6RA, IL-6 R alpha, IL-6R, IL6RA, interleukin 6 receptor, Membrane glycoprotein 80 Background:Part of the receptor for interleukin 6. Binds to IL6 with low affinity, but does not transduce a signal. Signal activation necessitate an association with IL6ST. Activation may lead to the regulation of the immune response, acute-phase reactions and hematopoiesis. Low concentration of a soluble form of IL6 receptor acts as an agonist of IL6 activity.