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Role of Psl and Pel in the matrix thickening of the dual-species biofilms. The matrix thickness of biofilms was tested by flipping the biofilms upside down. PAO1 ΔpelA (A and D), Δpsl (B and E), and ΔpelA Δpsl mutants (C and F) were grown as monospecies biofilms (A to C) or together with EF (D to F) as dual-species biofilms.
