peritoneal macrophages from the endotoxin-unresponsive c3h/hej substrain of mice were entirely refractory to activation in vitro by protein-free lps , a defect that was not overcome by co-culture of spleen cells from the responder c3h/st substrain with lps resistant c3h/hej macrophages .
C0014264
endotoxin
C0023810
lps