In sandwich ELISAs, less than 0.05% cross-reactivity with recombinant mouse (rm) IL-33 is observed. Reconstitute at 0.2 mg/mL in sterile PBS. Endoxin level is <0.10 EU per 1 μg of the antibody by the LAL method. IL-33 (Interleukin-33) is a 270 amino acid