actually , the lipoamino acids , as well as lipopolysaccharide , strongly activated the macrophages to generate the immunoregulatory substances prostaglandin e2 and interleukin-1 , but their effect on the induction of l929 cell cytolytic factor ( a possible tumor necrosis factor ) , another immunoregulatory substance , was weaker than that of lipopolysaccharide .
C1511620
induction
C0007634
cell