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Semilogarithmic plots of 13NH
efflux from
the cytosolic compartments of barley and rice roots. Plants were
prelabeled under steady-state conditions, with NH
provided externally at 10 mM. Plots have been corrected for specific
activities of 13N tracer (2, 21), allowing a direct
comparison of initial efflux rates by inspection of the
y-intercepts of the regression lines.
