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Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): AlfA is a bacterial actin-like protein that segregates plasmids in Bacillus subtilis. AlfA assembles into helical filaments, which associate to form bundles (seen in the background electron micrograph of a negatively stained sample). Single filaments of AlfA have an architecture different from that of other actins: they are more highly twisted and ribbon-like, with a unique orientation of the protomers. The reconstruction of the filament is shown on the left. (Image designed by Justin Kollman.) (See related article on page 6219.)

J Bacteriol. 2009 October; 191(20): Cover