@misc{indiciae42fbf97712dd,
  title = {Amino-acid sequence invariance and genetic code.},
  author = {A C North},
  year = {1972},
  doi = {10.1038/newbio239076a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4512828/},
  note = {Source identifier: 4512828}
}