title: Plasmids containing multiple copies of cloned DNA for use as DNA size markers for gel electrophoresis, constructed by bacteriophage T4 transduction.
mesh_terms: D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004269:DNA, Bacterial / Q000235:genetics*; D004587:Electrophoresis, Agar Gel; D004926:Escherichia coli / Q000235:genetics*; D005784:Gene Amplification; D008970:Molecular Weight; D010957:Plasmids; D012091:Repetitive Sequences, Nucleic Acid; D013604:T-Phages / Q000235:genetics; D014161:Transduction, Genetic
chemical_list: D004269:DNA, Bacterial; D004262:DNA Restriction Enzymes