In direct ELISAs, less than 1% cross-reactivity with recombinant human (rh) IL-1 alpha, rhIL-1 RI, recombinant mouse (rm) IL-1 alpha, rhIL-1 beta, rmIL-1 beta, recombinant rat IL-1 beta, rhIL-1ra, rmIL-1ra, and recombinant rhesus monkey IL-1ra is observe