This antiserum against Human IL-1 Receptor Type II (IL-1RII) has been tested for use in ELISA, radioimmunoassays and immunoprecipitation. Reactivity in other immunoassays is unknown. IL-1RII has been termed p68 or CD121 in some laboratories. IL-1RII has been shown to bind IL-1, IL-1a and IL-1b.