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1H (Left) and 31P NMR (Right) spectra of WT hearts showing the effect of increasing NO concentration on cardiac Mb and energy status. Assignments: ATP, adenosine triphosphate (γ-, α-, and β-phosphorus); MbO2, oxygenated myoglobin; metMb, metmyoglobin; PCr, phosphocreatine; Pi (ext.) and (int.), extracellular and intracellular inorganic phosphate, respectively.
