interleukin 2 ( il-2 ) , produced with and without co-stimulation by the burkitt 's lymphoma line daudi , was purified 37,000-fold to apparent homogeneity from lymphocyte conditioned medium by ( nh4 ) 2so4 precipitation , deae-cellulose ion-exchange chromatography , gel filtration , and chromatography on blue agarose and on procion-red agarose .
C0006413
burkitt 's
C0024264
lymphocyte