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(A) Whole body autoradiogram of a mouse euthanized 5 minutes after the intravenous injection of [14C]-histamine.124 (B) India ink visualization of complexity of the microvasculature of the cortex of rat brain.125 (C) Vascular cast of the microvasculature of the human cerebellar cortex. The distance between capillaries in brain is about 40 μm.126
