citation title=Induction of release of tumor necrosis factor from human monocytes by staphylococci and staphylococcal peptidoglycans citation author=Timmerman CP citation author=Mattsson E citation author=MartinezMartinez L citation author=de Graaf L citation author=van Strijp JAG citation author=Verbrugh HA citation author=Verhoef J citation author=Fleer A citation journal title=Infect Immun citation year=1993 citation volume=61 citation pages=41674172