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Front cover illustration

Colonies of the purple photosynthetic bacterium Rhodospirillum centenum. Upon starvation, R. centenum differentiates into heat- and desiccation-resistant cyst cells. Cyst production leads to the formation of large, striated colonies. Photograph courtesy J. E. Berleman and C. E. Bauer, Indiana University. See the paper by Berleman & Bauer on pp. 383-390.