Description:
<jats:title>Abstract</jats:title><jats:p>More than 30 conjugative R plasmids between 60 and 70 Md in size were identified in wild type strains of <jats:italic>Enterobacteriaceae</jats:italic> isolated in German Democratic Republic, Bulgaria, Mongolia, Poland, Ethiopia, Iraque, and Soviet Union. They have been characterized by means of several genetic and molecular techniques as members of a new incompatibility group, termed IncZ. The properties of these plasmids including digestion pattern after EcoRI treatment demonstrate a phylogenetic relatedness.</jats:p>