@misc{indiciaeb2d1911dfe63,
  title = {An expanded genetic code with a functional quadruplet codon.},
  author = {J Christopher Anderson and Ning Wu and Stephen W Santoro and Vishva Lakshman and David S King and Peter G Schultz},
  year = {2004},
  doi = {10.1073/pnas.0401517101},
  url = {https://pubmed.ncbi.nlm.nih.gov/15138302/},
  note = {Source identifier: 15138302}
}