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Activity per unit of chlorophyll (Chl) of two cytosolic enzymes, SPS (A) and cFBPase (B), for 23°C leaves (open bars), 23°C/5°C leaves (shaded bars), and 5°C leaves (black bars). Leaves were collected 2 h into the photoperiod and frozen at the temperature of liquid N2. Each value represents the mean ± sd of three different leaves from three different plants.
