Figure 6.

Colonization by strains carrying multi-copy rscS 1. The log of the relative competitive index (log RCI) for each juvenile squid in the experiment is plotted on the x-axis. Log RCI is calculated as the log of the fraction of Em^R bacteria in the homogenate divided by the fraction of Em^R bacteria in the inoculum. Each circle represents a single animal. Circles with arrows represent animals in which no Em^R bacteria were present in the 100 to 200 colonies screened from the homogenate; therefore, the log RCI is below the limit of detection and the values plotted for these animals are approximate. In the competition between vector- and rscS1-containing cells, all of the colonies screened from the homogenate were the Em^S rscS1-containing strain (black circles). The position of the circles on the y-axis is merely for spacing.