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Effect of different concentrations of γ-PGA on MS2 viability at 50 °C, over the time course of 72 h. Experiments were conducted in quadruplicate (n = 4). Error bars represent the standard error of the mean. (PBS = non-formulated phage in phosphate buffered saline, used as a control; PGA = formulated phage with poly-gamma-glutamic acid).
