Studies on patients with sickle-cell disease now shed light on the physiological battle between hemoglobin and the vasoregulator nitric oxide. It appears that hemoglobin scavenges NO in these patients, likely contributing to vascular complications (pages 1383–1389).
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Liao, J. Blood feud: Keeping hemoglobin from nixing NO. Nat Med 8, 1350–1351 (2002). https://doi.org/10.1038/nm1202-1350
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DOI: https://doi.org/10.1038/nm1202-1350