Erratum: In the article “The Organization of Cerebellar and Basal Ganglia Outputs to Primary Motor Cortex as Revealed by Retrograde Transneuronal Transport of Herpes Simplex Virus Type 1,” by John E. Hoover and Peter L. Strick, which appeared on pages 1446–1463 of the February 15, 1999 issue, the first sentence of the acknowledgments footnote should read, “This work was supported by the Veterans Affairs Medical Research Service and by United States Public Health Service Grant NS24328 (P.L.S.).”