Correction

PHYSIOLOGY. For the article “Nitric oxide reaction with red blood cells and hemoglobin under heterogeneous conditions,” by Tae H. Han, Daniel R. Hyduke, Mark W. Vaughn, Jon M. Fukuto, and James C. Liao, which appeared in number 11, May 28, 2002, of Proc. Natl. Acad. Sci. USA (99, 7763–7768; First Published May 21, 2002; 10.1073/pnas.122118299), the Note Added in Proof on page 7768 appeared incorrectly due to a printer's error. The term “myoglobulin” should be “myoglobin.”