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Elevated urinary levels of nitrate (NO3−) and cyclic guanosine monophosphate (cGMP) in high-altitude Amhara but not Oromo. Low-altitude (open circles) and high-altitude (close circles) Amhara and Oromo healthy volunteers (men in blue and women in pink) were recruited. Amhara have significantly higher NO3− (A) and cGMP (B) levels at high vs. low altitudes, whereas Oromo do not. Black line indicates sample mean, while gray line represents grand mean of all study groups.
