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Differential expression of OxyR and Trx (thioredoxin) proteins. P. gingivalis 33277 cells were grown under excess-hemin (WH) or hemin-limited (HL) conditions. OxyR and Trx levels were determined by ELISA and reported as the mean absorbance from three independent experiments. Error bars represent standard deviations. Asterisks indicate a statistically significant difference in protein expressions in P. gingivalis grown under different hemin concentrations (t test; P < 0.001).
