because no expansion in the clone size of tolerogen-specific precursors of ag-specific il-2-secreting t cells ( pil-2 ) is observed among tolerant animals , and because the pil-2 cells from tolerant mice are incapable of differentiating into cytotoxic and delayed hypersensitivity effector cells , we further propose that the precociously primed pil-4 cells function as `` '' suppressor '' '' cells , helping to maintain the tolerant state .
C1327616
secreting
C0007634
cells