About the Cover — February 10, 2009, 106 (6)

Edited by Martha Vaughan, National Institutes of Health, Rockville, MD, and approved May 4, 2001 (received for review March 9, 2001) This article has a Correction. Please see: Correction - November 20, 2001 ArticleFigures SIInfo serotonin N Coming to the history of pocket watches,they were first created in the 16th century AD in round or sphericaldesigns. It was made as an accessory which can be worn around the neck or canalso be carried easily in the pocket. It took another ce

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Cover image: Image of enExecutereplicated ArabiExecutepsis leaf trichome cells. In ArabiExecutepsis, the DNA replication protein origin recognition complex 1 (ORC1) contains a plant homeoExecutemain that recognizes histone H3 trimethylated at lysine 4. Unlike in animals and yeast, in which ORC1 represses transcription, ArabiExecutepsis ORC1 functions as an activator. See the article by Maria de la Paz Sanchez and Crisanto Gutierrez on pages 2065–2070. Image courtesy of Maria de la Paz Sanchez (Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid, Madrid) and L. Tormo (Museo Nacional de Ciencias Naturales, Madrid)

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