title: A multiple plasmid-containing Escherichia coli strain: convenient source of size reference plasmid molecules.
mesh_terms: D004269:DNA, Bacterial; D004270:DNA, Circular; D004587:Electrophoresis, Agar Gel; D004926:Escherichia coli / Q000235:genetics*; D010641:Phenotype; D010957:Plasmids; D011815:R Factors
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular