Fig 10.

Nucleases are required for optimal squid colonization. Juvenile squid were exposed to an inoculum containing a 1:1 ratio of wild-type V. fischeri and either the xds (A) or dns (B) mutant. At 48 hours post-infection, the ratio of mutant to wild-type bacteria in each light organ was assessed by plating squid light organs. The results are expressed as the relative competitive index (RCI). An RCI above 1.0 indicates that the mutant was dominant. These results are representative of three separate trials.