purified ppd-primed leu-3+ cells , when co-cultured for 7 days with fresh autologous leu-2+ cells , induced differentiation of leu-2+ but not leu-3+ cells into specific suppressor t cells , which subsequently inhibited the proliferative response of fresh leu-3+ cells to ppd but not to tetanus toxoid or allogeneic non-t cells .
C0007589
differentiation
C0007634
the