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The oral pathogen Porphyromonas gingivalis expresses a homolog of the internalin family protein InlJ. Inactivation of inlJ reduced monospecies biofilm formation by P. gingivalis. In contrast, heterotypic P. gingivalis-Streptococcus gordonii biofilm formation was enhanced in the InlJ-deficient mutant. The results indicate a nuanced role for InlJ in regulating biofilm accumulations of P. gingivalis.
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Capestany et al. (2006) studied this question.
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