There are a number of ELISA Kits available for the measurement of IL-1, another term for the human protein, interleukin 1 beta. Other synonyms may include: IL-1 beta, catabolin, preinterleukin 1 beta, pro-interleukin-1-beta, IL1-BETA, and IL1F2. It is encoded by the IL1B gene to yield a protein 269 amino acids in length and 30.7 kDa in size. The protein is categorized into the IL-1 family.