CELL BIOLOGY. For the article “Mitochondrial biogenesis by NO yields functionally active mitochondria in mammals,” by Enzo Nisoli, Sestina Falcone, Cristina Tonello, Valeria Cozzi, Letizia Palomba, Mara Fiorani, Addolorata Pisconti, Silvia Brunelli, Annalisa Cardile, Maura Francolini, Orazio Cantoni, Michele O. Carruba, Salvador Moncada, and Emilio Clementi, which appeared in issue 47, November 23, 2004, of Proc. Natl. Acad. Sci. USA (101, 16507–16512; first published November 15, 2004; 10.1073/pnas.0405432101), the affiliations and address for Maura Francolini appeared incorrectly. The correct address appears below.
Department of Medical Pharmacology, Consiglio Nazionale delle Ricerche, Institute of Neuroscience, Cellular and Molecular Pharmacology, Center of Excellence on Neurodegenerative Diseases, University of Milan, 20129 Milan, Italy