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Colony morphology of P. aeruginosa PAO1 and recombinant strains. Strains were grown on VBMM agar containing Congo red, brilliant blue and 1 % l-arabinose. Rugose colonies were observed in P. aeruginosa expressing tpbB and ml1419c. PAO1 wild-type, P. aeruginosa expressing ml1419cΔGGDEF and the vector control (VC) form round colonies with smooth surfaces. Scale bar corresponds to 1 mm.
