4-1BBL/TNFSF9 Protein, a cytokine, binds TNFRSF9, inducing proliferation in activated peripheral blood T-cells.It's implicated in activation-induced cell death (AICD) and contributes to cognate interactions between T-cells and B-cells/macrophages.Functioning as a homotrimer enhances its biological activity.Animal-Free 4-1BBL/TNFSF9 Protein, Mouse (His) is the recombinant mouse-derived animal-Free4-1BBL/TNFSF9 protein, expressed by E.coli , with C-His labeled tag.This product is for cell culture use only.