title: Molecular characterization of plasmids from virulent and spontaneously occurring avirulent colonial variants of Shigella flexneri.
abstract: Spontaneous transition of Shigella flexneri from T- to O-type colonies with concomitant loss of virulence dose not appear to be accompanied by a change in any of the four plasmic species found in the virulent parent.
mesh_terms: D004269:DNA, Bacterial / Q000235:genetics; D008970:Molecular Weight; D010957:Plasmids; D012763:Shigella flexneri / Q000235:genetics* / Q000472:pathogenicity
chemical_list: D004269:DNA, Bacterial