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Typical examples of nitrate-selective microelectrode recordings in Arabidopsis mesophyll cells during light/dark transitions; bars indicate the time at which the light or dark (shaded) treatment was applied. a, Wild-type mesophyll cytosol during light-to-dark and dark-to-light transition in one cell; b, nia1nia2 mesophyll cytosol during light-to-dark transition; c, nia1nia2 mesophyll cytosol during dark-to-light transition.
