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Front cover illustration

Colour-enhanced photograph of a section of a Bacillus subtilis swarm. The radiating dendrites (approximately 0·1-0·2 mm wide) expand outwards from a central point of inoculation to completely fill a plate in under 20 h once swarming commences. Image courtesy B. Holland, Université Paris-Sud, Orsay, Paris, France. See the paper by Julkowska et al. in this issue, pp. 1839-1849.