NCIt definition : A recombinant agent which is chemically identical to or similar to the endogenous
protein cytokine interleukin-1 (IL-1). The IL-1 precursor is produced by monocytes,
activated macrophages, and other cell types; mature IL-1 is generated by proteolytic
cleavage by proteases such as IL-1-beta converting enzyme (ICE). This agent enhances
T cell proliferation and B cell growth and differentiation and induces the expression
of proinflammatory cytokines. (NCI04);