@misc{indiciae7899a392bf9f,
  title = {Proteins lacking certain amino acids.},
  author = {D M Kirschenbaum},
  year = {1974},
  doi = {10.1016/0003-2697(74)90081-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/4817508/},
  note = {Source identifier: 4817508}
}