The function of Ensembl gene identifier ENSG00000137496 (IL18BP, interleukin 18 binding protein) is as follows. Isoform A binds to IL-18 and inhibits its activity. Functions as an inhibitor of the early TH1 cytokine response. {ECO:0000269|PubMed:10023777, ECO:0000269|PubMed:10655506, ECO:0000269|PubMed:31213488}.