In these images, E. coli bacteria harbor proteins from a bacteria-killing virus that can eavesdrop on bacterial communication. At left, one protein from the virus has been tagged with a red marker. At right, the virus has overheard bacterial communication indicating the bacteria have achieved a quorum; it sends its protein to the poles of the cell (yellow dots). (Bonnie Bassler and Justin Silpe, Department of Molecular Biology, Princeton University)
