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BslA acts primarily as an hBMEC adhesin. Data are expressed as the percentage of intracellular organisms (CFU) recovered compared to the total cell-associated (adherent) bacteria recovered for each strain. Strains were B. anthracis Sterne 34F2 and its isogenic pXO1− and bslA::ΩSpr mutants. Data from a representative experiment are shown; error bars indicate 95% confidence intervals of mean values from three wells. **, P < 0.005.
