Figure 4: Dendrogram showing the genetic variability cumulated during the PSPE, taking into account each strain at with its derived mutated lineages. String order: Vhec2, Vhec4, Vhec7, TR3, TR4, TR7, O157-3, O157-10, and O157-37. Boxed profiles correspond to the parental strains. Null alleles are indicated with 70 and with 80 when an amplification product was detected but the VNTR was missing.