Examples of agarose gels showing BOX-PCR obtained with the non fluorescent and fluorescent primers. Letter N indicates the non fluorescent primer, H indicates HEX primer, while F indicates 6-FAM primer. Letter E indicates the DNA extractions performed twice (E1 and E2), while letter P indicates the PCR performed twice (P1 and P2). For strain DS3, two diverse gels are shown. M, marker 50 bp.