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Sublines have variable extracellular product profiles. (A) Rhamnolipids were extracted from 72-h cultures and measured using a standard curve (n = 3). (B, C) Pyocyanin (B) and pyoverdine (C) (both n = 6) were extracted from 24-h cultures and measured via determination of the absorbance. (D) Pseudomonas quinolone signal (PQS) production was assayed using an extraction and fluorescence technique. **, P < 0.01.
