although both groups had an increase in interleukin 2 receptor ( il2r ) , transferrin receptor ( tfr ) , and mhc class ii ag ( hla-dr ) positive cells after pha stimulation , the mean percentage of tfr+ cells was significantly greater in the young than in the elderly ( p less than 0.05 ) .
C0017349
mhc class ii
C0019764
hla-dr