@misc{indiciae78008dc33195,
  title = {Carboxyl group modification in glucagon.},
  author = {R M Epand and R F Epand},
  year = {1972},
  doi = {10.1016/0005-2795(72)90189-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4653335/},
  note = {Source identifier: 4653335}
}