Cover photograph (Copyright © 2002, American Society for Microbiology. All Rights Reserved.): Electron micrograph of Leptospira biflexa. Some parts of the cellular outer membrane were removed, exposing periplasmic flagella. In spirochetes, flagella are located between the protoplasmic cylinder and the outer membrane sheath, and in Leptospira spp., one flagellar filament arises at each end of the cell. (Photo provided by Evelyne Couture-Tosi.) (See related article on page 452.)
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