Robert Rutschman, Roland Lang, Matthias Hesse, James N. Ihle, Thomas A. Wynn, and Peter J. Murray. Cutting Edge: Stat6-Dependent Substrate Depletion Regulates Nitric Oxide Production. The Journal of Immunology 2001;166:2173–2177.

Due to an author oversight, an important paper (Modolel et al. 1995 Eur. J. Immunol. 25:1101) was not cited that describes early work on the regulation of arginase and inducible NO synthase in macrophages. This paper also shows that addition of arginine to IL-4-treated macrophages is capable of restoring NO production. The authors apologize for this omission. The results and conclusions of the paper remain unchanged.