Figure 4. Relative frequency of types of pigments produced by P. aeruginosa strains: A) Examples of different pigments and pigment combinations produced in Mueller-Hinton agar with antibiotics; B) 1: pyoverdine, 2: fluorescein, 3: fluorescein + pyocyanin, 4: pyomelanin, 5: pyoverdine + pyocyanin, 6: pyoverdine + fluorescein, 7: pyoverdine + pyomelanin, and 8: no pigment.
