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Southern blot analysis shows transposon isertion. X-ray film image after exposure to DNA of Xanthomonas citri subsp. citri strain 306 isolated mutant clones, previously cleaved with Eco RI and hybridized with the sequence of the transposon Tn5 labeled with the AlkPhos Direct RPN 3680 kit (Amersham Biosciences). Mutants with a double insert are marked with an asterisk.
