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Summary model of distinct modes of biofilm formation in squid-colonizing V. fischeri. The phylogenetic tree is simplified from Fig. 1 and illustrates key features of squid symbionts in the three groups. Shown are divergent aspects (RscS and SypE) and conserved regulation (BinK). In all groups, the syp exopolysaccharide locus is required for squid colonization.
