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Cover photograph (Copyright © 2008, American Society for Microbiology. All Rights Reserved.): Epifluorescence micrograph of Xenorhabdus poinarii bacteria expressing green-fluorescent protein (green rods) colonizing the intestine of a Steinernema carpocapsae nematode. All Steinernema sp. nematodes are mutualistically colonized by Xenorhabdus spp. For example, S. carpocapsae is specifically associated with X. nematophila bacteria but cannot be colonized by other Xenorhabdus spp., including X. poinarii. However, X. poinarii carrying the X. nematophila-specific nilABC genes can colonize S. carpocapsae nematodes, as shown here, indicating that nilABC are host range specificity determinants. The composite photograph was artificially colorized by using Metamorph 4.5r6 software. Magnification, ×600. (See related article on page 4121.)
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