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Biofilm formation in Pseudomonas aeruginosa. (1) Non-motile cells begin to accumulate forming the stalk (blue); (2) most of the outer cells express the PQS system (orange); (3) eDNA begins to accumulate over the stalk forming ring-like shaped structures (orange fibers); (4) motile cells migrate toward the top the stalk (green); (5) motile cells form the cap (green).
