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Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): Encounter of two unrelated strains of swarming Proteus mirabilis expressing either green fluorescent protein (left) or DsRed (right). Black areas are unoccupied patches of agar. Where swarmer cells of the green strain come in close contact with red swarmer cells, they transform into rounded cells. These rounded cells are dying and can be induced only by very intimate contact between strains. Here, the red swarm is clearly dominant over the green one. Dominance confers a competitive advantage in colonization of new territory. (See related article on page 3892.)
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