Gram Negative Bacteria Induce Proinflammatory Cytokine Production By Monocytes in the Absence of Lipopolysaccharide (LPS). (October 2000) - Uronen, H.; Williams, A. J.; Dixon, G.; Andersen, S. R.; van der Ley, P.; van Deuren, M.; Callard, R. E.; Klein, N.