lymphocytes obtained by ficoll-hypaque density gradient centrifugation of leukocytes from 40 blood bank donors were incubated at 10 ( 6 ) cells/ml for 24 h with 5 micrograms phytohemagglutinin/ml serum-free rpmi 1640 medium and secreted 34 +/- 6 u lymphotoxin/ml and 52 +/- 29 u interferon/ml .
C0007634
cells
C1327616
secreted