“…Abnormal IL-6 production is associated with a variety of diseases (2) such as rheumatoid arthritis (3), AIDS (4,5), osteoporosis (6,7), psoriasis (8), multiple myeloma (9, 10) and Kaposi's sarcoma (11). Thus the interactions between IL-6 and its associated receptors, the transmembrane glycoproteins IL-6R and gp130 (12), present an attractive target for therapeutic antagonists (13). IL-6 signaling is known to proceed via initial binding of IL-6 to the IL-6R to form a binary 1:1 complex.…”