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Acid sensitivity of oPACE. Weight loss vs time for oPACE5-20 (red) and PACE (black) upon incubation at 37 °C in (A) PBS at pH 7.4 or in sodium acetate buffer solutions at (B) pH 6.0, (C) 5.0, or (D) 4.0. The dry weight of the residual polymers is reported as a percentage of the initial polymer weight.
