B7-H2/ICOSLG is an important ligand of the T cell receptor ICOS and mediates immune responses. It acts as a costimulatory signal, promoting T and B cell proliferation, cytokine secretion, and plasma cell differentiation. B7-H2/ICOSLG Protein, Mouse (HEK293, His) is the recombinant mouse-derived B7-H2/ICOSLG protein, expressed by HEK293 , with C-His labeled tag.