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Schematic representation of the van operons in P. thiaminolyticus PT-2B1 (top) and P. apiarius PA-B2B (bottom) and of the PCR primers used for their characterization. The percentages refer to the levels of identity between the corresponding genes in the two operons. Open arrows represent coding sequences and indicate the direction of transcription. Solid and dashed small arrows indicate the primers used for TAIL and long PCR, respectively.
