Erratum
In Jean L. Marx's Research News article "Nerve growth factor acts in brain" (13 June, p. 1341), the affiliation of Rita Levi-Montalcini 40 years ago should have been given as the Department of Zoology, Washington University. Viktor Hamburger was chairman of that department. Levi-Montalcini and Hamburger were collaborators on papers on nerve growth factor at that time.