Fig 6.

Differential expression of dps and ahpC in P. gingivalis 33277 in response to hemin concentrations. Total RNAs were extracted from P. gingivalis grown under hemin-limited (HL) conditions or those grown under hemin-limited conditions first and then cultured in standard TSB with hemin (BH). Expression of dps and ahpC in P. gingivalis grown without hemin was measured using qRT-PCR and compared to that in P. gingivalis with hemin after normalized with expression level of glk. Error bars represent standard deviations. An asterisk indicates a statistically significant difference between expression levels of genes in P. gingivalis grown without hemin and those in P. gingivalis grown in TSB with hemin (t test; P < 0.05).