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(A) Extracellular aminopeptidase activities, and (B) cell-specific aminopeptidase activities and sedimentary protein turnover time in the different high-CO2 experimental systems (1,000–20,000 ppm) and in the controls (i.e., 400 ppm), showing mean values and relative SDs. Significant differences between treatments and controls are indicated with asterisks: *p < 0.05, **p < 0.01, and ***p < 0.001.
