the following evidence indicated that monocyte-mediated tumor cell lysis was independent of superoxide anion ( o2- ) and h2o2 production : ( a ) although human blood monocytes incubated for 24 h with gamma interferon produced twice as much o2- as control or maf-treated monocytes , gamma interferon did not activate monocyte tumoricidal activity unless combined with lipopolysaccharide endotoxin , 0.2 ng/ml or more ;
C0023810
lipopolysaccharide
C0014264
endotoxin