The FCAR/CD89 protein is crucial and can specifically bind to the Fc region of immunoglobulin α to promote the production of cytokines. FCAR/CD89 binds to the Fc epsilon RI gamma 2 receptor, induces gamma 2 tyrosine phosphorylation, and is complexly involved in signaling pathways and immune responses. FCAR/CD89 Protein, Human (HEK293, His) is the recombinant human-derived FCAR/CD89 protein, expressed by HEK293 , with C-6*His labeled tag. The total length of FCAR/CD89 Protein, Human (HEK293, His) is 206 a.a., with molecular weight of ~40 kDa.