Homotypic biofilm formation by P. gingivalis. P. gingivalis wild-type (A7436, W83, and ATCC 33277) strains and the hmuY deletion mutant strain constructed in A7436 (TO4) were grown in basal medium supplemented with hemin (Hm) or dipyridyl (DIP). The microtiter plate biofilms were stained with crystal violet. Data are shown as the mean ± SD of three independent experiments (n = 24). Differences between the TO4 mutant and the wild-type A7436 strain expressed as p values are given above the respective bars.
Olczak et al. BMC Microbiology 2010 10:134 doi:10.1186/1471-2180-10-134