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Where applicable, antibiotics were used in the following concentrations: gentamicin (Gn; 50 μg/ml), kanamycin (Km; 50 μg/ml), rifampicin (Rif; 100 μg/ml), tetracycline (Tc; 50 μg/ml) and piperacillin (Pip; 50 μg/ml) for P. chlororaphis 30–84, and ampicillin Ap (100 μg/ml), Gn (15 μg/ml), Tc (25 μg/ml) for E. coli.
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