CD80 is a costimulatory cytokine for cancer immunity that is activated by binding to CD28 or CTLA-4. Tumor immune evasion occurs when CD80 expression is low. The increased expression of CD80 induced by TP53 stimulates anti-tumor immune responses. B7-1/CD80 Protein, Cynomolgus (HEK293, His) is the recombinant cynomolgus-derived B7-1/CD80 protein, expressed by HEK293 , with C-6*His labeled tag.