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Growth of F. johnsoniae strain A3 at 15°C in tap water supplemented with proline at various concentrations. Symbols: ○, blank, no proline added; ▵, 2.5 μg proline C liter−1 added; □, 5.0 μg proline C liter−1 added; ⋄, 10 μg proline C liter−1 added; ▴, 25 μg proline C liter−1 added; ▪, 50 μg proline C liter−1 added; ⧫, 100 μg proline C liter−1 added; •, 200 μg proline C liter−1 added. Error bars indicate standard deviation of colony count in duplicate flasks.
