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Swimming motility assay. Aliquots (3 µL) of each culture (Xcc 306, hupB and c‐hupB) in the exponential growth phase were placed in the centre of a Petri dish containing NYGB‐soft agar medium. The plates were incubated at 28 °C for 72 h, and photographs were taken. Xcc, Xanthomonas citri ssp. citri.
