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Tissue penetration of T. denticola. Penetration rates were determined by counting cell numbers after 8 h of incubation of T. denticola strains ATCC 35405, AK-1, ATCC 33520, and ATCC 33520/pKMlrrA with HEp-2 cell tissue layers. Values are means and standard deviations for three separate experiments performed in duplicate. The resistances of the tissue layers were between 12 and 14 Ω for the experiments.
