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Figure 5   Net NO2– uptake (µmol mg–1 chlorophyll min–1 ) by isolated chloroplasts as a function of NO2– concentration when the medium contained 0 (gold or cyan symbols) or 0.3 (red or blue symbols) mM HCO3– . Shown are the mean ± SE (n = 3 ) for wheat (circles) and pea (inverted triangles).

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