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- [4] A Porphyromonas gingivalis Mutant Defective in a Putative Glycosyltransferase Exhibits Defective Biosynthesis of the Polysaccharide Portions of Lipopolysaccharide, Decreased Gingipain Activities, Strong Autoaggregation, and Increased Biofilm Formation INFECTION AND IMMUNITY, 2010, 78 (09) : 3801 - 3812