Pro-Interleukin-1 (IL-1) beta (IL-1 beta) is the inactive precursor form of the potent pro-inflammatory cytokine Interleukin-1 (IL-1) beta (IL-1F2), consisting of 269 amino acidsHailey et al. 2009 J Biol Chem 284(38): 26137-48Lopez-Castejon & Brough 2011 Cytokine Growth Factor Rev 22(4): 189-95