however , with a second signal provided to responsive macrophages by contaminating endotoxin , added bacterial lipopolysaccharide ( lps ) , or heat-killed listeria monocytogenes ( hklm ) , all three types of interferon induced cytolytic activity , with muifn-gamma approximately 500 to 1000-fold more active than either muifn-alpha or -beta .
C0014264
endotoxin
C0023810
lipopolysaccharide