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Production of PGA by B. subtilis 1551 (A) and the PGA-degrading mutant B. subtilis MP5 (B) in medium E. The strains were cultivated done at 35°C for 11 days in 500-ml conical flasks equipped with three baffles containing 100 ml of medium E. Symbols: ●, optical density as measured with a Klett-Summerson colorimeter; □, PGA concentration.
