parenteral injection of peptidoglycan-polysaccharide ( pg-ps ) polymers from certain bacterial species produces spontaneously relapsing erosive synovitis in susceptible rat strains , and normally subarthropathic amounts of pg-ps and lipopolysaccharide ( endotoxin ) can reactivate arthritis initially induced by pg-ps .
C0023810
lipopolysaccharide
C0014264
endotoxin