ABSTRACT
O2-Symbol for superoxide anion, an oxygen metabolite toxic to microorganisms.
O Antigen Referring to heat-stable, alcohol-resistant lipopolysaccharide-protein complex (somatic antigen) from the Gram-negative bacteria of the family Enterobacteriaceae. The lipopolysaccharide component of the O antigen consists of the repeating trisaccharide units, 2-keto-3-deoxyoctonate and lipid A.
