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Effect of pressure pretreatment on survival and loss of β-galactosidase activity in cells incubated at pH 3.5 for varying periods of time. Data are means ± standard deviations (error bars). Symbols: ●, survival of native cells; ■, survival of pressure-damaged cells; ○, β-galactosidase activity of native cells; □, β-galactosidase activity of pressure-damaged cells.
