we have shown that ( a ) purified t-helper cells induce cells of another t-cell set- , expressing the ly123+qa1+ surface phenotype , to exert potent suppressive activity , ( b ) this t-t interaction plays an important role in regulating in vivo immune responses , and ( c ) this interaction represents an important barrier to protocols intended to augment the immune status of individuals by adoptive ( or active ) immunotherapy .
C0301872
immune responses
C0020964
immune status