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Cover photograph (Copyright © 2010, American Society for Microbiology. All Rights Reserved.): Xenoturbella is a simple marine worm with unresolved phylogeny (positioned within the Deuterostomia or possibly at the root of the Bilateria). This worm hosts two types of endosymbionts (Gammaproteobacteria and Chlamydiae-like) with unknown function. Starting with the specimen on the left and moving clockwise, Xenoturbella is shown in lateral view, ventral-lateral view, and dorsal view; interspersed are micrographs of the symbionts (obtained by fluorescence in situ hybridization [symbionts are red; host tissue is green or blue] and transmission electron microscopy). The length of each worm specimen is approximately 1 cm, and the diameter of the symbiont cells is approximately 0.5 µm. (See related article on page 2657.)

Appl Environ Microbiol. 2010 April; 76(8): Cover