Anti-CD28, clone C28/77

1 mg/ml in sterile PBS, BSA free, sodium azide free. This antibody recognizes a glycoprotein of 44-88kDa, which is identified as CD28. It is the critical T-cell co-stimulatory receptor which provides to the cell the important second activation signal by binding CD80 and CD86 that are expressed by antigen presenting cells. Besides its co-stimulation role, CD28 functions in preventing T-cells from anergic hyporesponsive state or from undergoing premature apoptotic cell death. CD28 is also expressed on human fetal NK cells and some NK cell lines, whereas on murine NK cells the CD28 expression is much broader. Protein function: Involved in T-cell activation, the induction of cell proliferation and cytokine production and promotion of T-cell survival. [The UniProt Consortium]