Fig 1.
Differential expression of sod in P. gingivalis strains. P. gingivalis strains were first grown in TSB medium without hemin for three generations (HL, hemin limitation) and then grown in standard TSB medium for another two generations (WH, with hemin). Expression of the sod gene in both the wild-type strain 33277 and the oxyR mutant was determined using real-time RT-PCR analysis. The change in expression levels was calculated by the ΔΔCT method, where ΔCT = CT(cells grown under standard conditions) − CT(cells grown under hemin limitation), and normalized to that of glk. Standard deviations are indicated (n = 3).