FIG. 2.
Invasion of A549 respiratory epithelial cells by GBS type III strain M781. (A) The invasion assay was performed with GBS grown in a chemostat at a cell mass doubling time of 1.8 h with 21% DO2. (B) Three invasion assays were performed in series with GBS grown in a chemostat at DO2 levels of 0.1 to 2.7, 20, and 0.3%. Data are means and standard deviations of two measures each for eight determinations.