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Blood oxygenation in cerebral vessels is an essential parameter to evaluate brain function and to investigate the coupling between local blood flow and neuronal activity. We apply resonance Raman spectroscopy in vivo to study hemoglobin oxygenation in cortex vessels of anesthetized ventilated mice. We demonstrate that the pairs of Raman peaks at 1355 and1375 cm−1 (symmetric vibrations of pyrrol half‐rings...
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