PFGE of SmaI-digested chromosomal DNAs isolated from VRE strains. λ, a bacteriophage λ DNA ladder used as a molecular size marker. Lanes 1 to 16, VRE strains CV1, KV12, KV21, FN1, TV1, TV2, TV3, TV4, TV5, TV6, TV7, TV8, TV9, TV10, TV11, and GV2, respectively.