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The effect of proteinase K on MR-1 proteins OmcA, fumarate reductase (FR), and Omp35. Either fumarate-grown whole cells (WC) or purified outer membrane (OM) fractions isolated from fumarate-grown MR-1 were treated with proteinase K. Results of duplicate experiments are expressed as the ratio of band intensity with proteinase K vs. protease-free control. *, statistically significant from FR control to P ≤ 0.006.
