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The original version of this article unfortunately contained a mistake. Materials and methods section, 2nd heading "Culture media and growth conditions": The first sentence was published with an error. The correct version is given here. Culture media and growth conditions SGA medium was the same as the previously described SMAG medium (Nikel et al. 2006b) except that 30 g l-1 glycerol was used instead of glucose, and 50 mg l-1 kanamycin was added for plasmid maintenance.