although t4+ and t8+ cells could produce almost equal amounts of helper factor activity upon pwm-stimulation , the interactions between t3 and t4 antigens on t4+ cells and ia-like antigens on monocytes and those between t3 and t8 antigens on t8+ cells and hla class i antigens on monocytes are respectively essential for the production of t4+ cell-derived and t8+ cell-derived helper factors .
C0039215
t4
C0019630
ia-like antigens