Nucleotide sequence of the ampicillin resistance gene of Escherichia coli plasmid pBR322.
Proc Natl Acad Sci U S A. 1978 Aug;75(8):3737-41. doi: 10.1073/pnas.75.8.3737.
Proc Natl Acad Sci U S A. 1978.
PMID: 358200
Free PMC article.