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Analysis of the PT modification in R. anatipestifer ATCC 11845. A, electrophoresis pattern of the iodine-cleaved genomic DNA from R. anatipestifer ATCC 11845 (lanes 4 and 5), with R. anatipestifer HXb2 (lacking PT-modifying genes; lanes 2 and 3) as a negative control. M, DNA ladder. B, LC-MS analysis of the PT-linked dinucleotides from R. anatipestifer ATCC 11845.
