Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): Intersection of zones of growth by different Pseudomonas aeruginosa strains with altered capacities to produce phenazines. The P. aeruginosa strains are growing on a lawn of Candida albicans; the image was taken after 72 h of coincubation. The red color results from a phenazine-derived toxin that accumulates within fungal cells when the two species are grown in close proximity. (See related article on page 504.)
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