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On the Cover: "What is a weed? A plant whose virtues have not yet been discovered." Ralph Waldo Emerson's observation takes on a special resonance this month as all plant biology celebrates the completion of the Arabidopsis genome project. In the painting that graces our cover this month (courtesy of Dr. Chris Somerville), the artist Janet Wehr captures the understated beauty of this simple weed-no-longer, which has, by virtue of its diminutive size, small genome, and brief life cycle, become a giant among scientists.