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Fig. 9. Time-dependent changes in extracellular [NO2-] after addition of nitrite to red blood cell (RBC) suspensions in a tonometer (A,B). The decrease in extracellular [NO2-] reflects an influx of nitrite into the RBCs. Note the different [NO2-] axes, haematocrits and O2 saturations. N2 and O2 indicate full deoxygenation and oxygenation, respectively. C and D show the corresponding methaemoglobin (metHb) values. See text for further details.