Germinal center B cells rescued from apoptosis by CD40 ligation or attachment to follicular dendritic cells, but not by engagement of surface immunoglobulin or adhesion receptors, become resistant to CD95-induced apoptosis - Koopman, G; Keehnen, RMJ; Lindhout, E; Zhou, DFH; de Groot, C; Pals, ST (Eur J Immunol, 1997)