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Thermosensitivity of the ΔA-NR and ΔS-NR proteins. NR activity (nitrite accumulation) was assayed in vitro at different temperatures (20°C, 30°C, and 35°C) on ammonium sulfate-precipitated extracts obtained from the wild-type (wt) or from different transgenic lines. Abbreviations of the genotypes of the transgenic lines are as defined in the legend of Figure 3.
