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Cover image: Crossbred chicks from the University of Illinois flock are an important animal model for studying the efficacy of novel sulfur-containing compounds. See related article on page 1868, in this issue (J. Nutr. 137: 1868–1873, 2007). Photo by David Riecks, courtesy of the University of Illinois at Urbana-Champaign. Copyright © 2007 David Riecks, University of Illinois at Urbana-Champaign.