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Perivascular CA IX expression at the distal end of elongated capillaries. Depicted are elongated capillaries running from the lower left corner of the image towards the upper right corner and making a hairpin-like turn at the tip. Consistent with the concept of a countercurrent oxygen exchange (oxygen diffusion shunt) between arterial and venous limbs of these capillaries, CA IX-positive cells are observed at the tip of the hairpin.
