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Pyruvate kinase (PK) activity in diatoms (a–e) grown at low CO2 (L-CO2; 400 ppm, dark grey bars) or high CO2 (H-CO2; 20,000 ppm, light grey and dashed bars), as specified in panel (a). Average and error bars (SD) are represented (n = 3). * p ≤ 0.05.
