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Front cover illustration: Scanning electron micrograph of freeze-dried cells of Myxococcus xanthus. Cells are about 600 nm in width subpolarly. Dynamic surface features of actively gliding cells have been arrested by shock freezing and are revealed by a characteristic surface profile, giving the cell body a twisted appearance along the cell axis. This surface profile is lost when cells are poisoned by KCN, which immediately stops the gliding process. The photograph was produced by Dr Heinrich Lünsdorf, GBF, Braunschweig, Germany. See the paper by Lünsdorf & Schairer on pp. 939-947.