pBR322 is a circular double-stranded plasmid widely used as a cloning vector for E. coli. The plasmid pBR322 was created at the University of California, San Franciso, the USA in 1977. The plasmid pBR322 is 4361 bp or 4.36 kb in length. The plasmid has two antibiotic resistance genes (ampicillin, tetracycline) and an origin of replication.
