monocytes or macrophages may be induced to produce il 1 by activators ( e.g. , lipopolysaccharide endotoxin ) that act directly or by antigens/mitogens ( e.g. , con a ) that stimulate inducer lymphocytes to release a lymphokine that stimulates macrophages .
C0023810
lipopolysaccharide
C0014264
endotoxin