Fig. 1From: From supernatants to cytokines: a personal view on the early history of IL-1, IL-1Ra, TNF and its inhibitor in rheumatologyReactivation by MCF of large amounts of collagenase and PGE2 production, along with the stellate aspect of fibroblast-like cells [5, 6]. IL interleukin, PGE2 prostaglandin E2Back to article page