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Ferricyanide-dependent O2 evolution from WT and fkbp20-2 mutant plants. Chloroplasts isolated from 12-week-old plants were used in these experiments. (A) Rates of O2 evolution. Data are means ± SE, n = 9. (B) Dependence of O2 evolution on light. ↑, light on; ↓, light off.
