@misc{indiciae320d1c9a314b,
  title = {Methods and reagents. Reducing background colonies with positive selection vectors.},
  author = {P N Hengen},
  year = {1997},
  doi = {10.1016/s0968-0004(97)01009-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/9066262/},
  note = {Source identifier: 9066262}
}