The ΔompU2 mutant strain displays slower growth rates in DOC. V. cholerae strains O395 (●), KKV780 (▴), KKV809 (▾), and KKV884 (■) were grown in LB at 37°C containing the concentrations of DOC indicated (note the logarithmic scale). Growth rates shown are relative to the growth rate in LB alone, as described previously (43). DC, deoxycholate.