when the frequencies of precursors of il 2-secreting t lymphocytes ( il 2tl-p ) were determined by limiting dilution analyses , class i mhc-reactive lyt-2+ t cells displayed frequencies ( f = 1/200 ) as high in magnitude as those within class ii mhc-reactive l3t4+ ( f = 1/100 ) .
C1327616
secreting
C0007634
cells