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(a) UV-HPLC osmolyte profile of P. syringae pv. syringae B728a grown in the presence of shredded lilac leaves. The asterisk indicates an unknown component of the extract. In the negative controls, which comprised shredded leaves incubated under identical conditions but without bacteria added (b) and fresh shredded leaves (c), peaks for the ectoine precursor ADABA or for ectoine itself were not observed. AU, arbitrary units.
