The objective of this study was to determine if the interaction between common oral commensal bacteria and oral epithelial cells would provide protective effects against the invasion of periodontopathogen Porphyromonas gingivalis. Oral epithelial OKF6/Tert cells were used in co-cultures with Streptococcus gordonii. Streptococcus oralis. Streptococcus mitis. https://www.roneverhart.com/BT21-Pop-Vinyl-Figure-Tata-687/