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Fig. 7. Oxygen partial pressure (PO2) distribution in the haemolymph in the median plane of Daphnia magna. Left: 1.7 mm Hb-rich animal at an ambient oxygen partial pressure (PO2amb) of 1.7 kPa. Right: 1.4 mm Hb-poor animal at a PO2amb of 5.1 kPa. Note the marked differences in the steepness of the PO2 gradients between both animals. The orientation of the animal with respect to the viewer is indicated by the positional information and by the small sketch in front left.





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