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Researchers created this diagram to summarize their findings about lethal interactions among 185 strains of Vibrio bacteria. Individual strains of bacteria are represented by the black lines protruding from the rim of the circle. Those adjacent to each other on the rim are more closely related than those farther apart. The black lines radiate from a Vibrio family tree (displayed in circular form rather than the more common vertical "tree" arrangement). Each green line represents an interaction between two strains in which one of the strains produces an antibiotic that kills the other. Blue bars along the circumference indicate strains that are killed by at least one other strain. Black bars indicate strains that kill at least one other strain. Red bars indicate "super killers"—strains that kill at least ten other strains. (Otto Cordero, Massachusetts Institute of Technology)[back]
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