SAP enables T cells to help B cells by a mechanism distinct from Th cell programming or CD40 ligand regulation.
Kamperschroer C, Roberts DM, Zhang Y, Weng NP, Swain SL. SAP enables T cells to help B cells by a mechanism distinct from Th cell programming or CD40 ligand regulation. J Immunol. 2008 Sep 15; 181(6):3994-4003.