ppd-stimulated il 1 release by mn did not appear to be due to endotoxin contamination , as 1 ) ppd contained 0.01 % endotoxin , 2 ) mn incubated in lps ( 0.1 micrograms/ml ) produced 19.5 +/- 13.9 u/ml , significantly less than ppd ( p = 0.03 ) , and 3 ) addition of polymyxin b ( 12.5 micrograms/ml ) abrogated il 1 production in response to lps ( 0.1 microgram/ml ) but had no significant effect on ppd induction of il 1 .
C0014264
endotoxin
C0023810
lps