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Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): Rhizobial bacteria engage in nitrogen-fixing symbioses with their legume hosts. Here, β-galactosidase-expressing Sinorhizobium meliloti bacteria (blue) penetrate an emerging Medicago truncatula root nodule primordium. (Image provided by Cara Haney and Sharon Long, Department of Biology, Stanford University.) (See related article on page 6833.)


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