the proliferative and cytotoxic progenitors in both fractions were examined by using a limiting dilution assay with interleukin 2 ( il 2 ) from four sources : 1 ) crude supernatant of a gibbon lymphoma ( mla-144 ) , 2 ) purified ( 150,000-fold ) mla-144 il 2 , 3 ) partially purified human il 2 , and 4 ) purified recombinant human il 2 .
C0021756
il 2
C0218986
recombinant human il 2