@misc{indiciae2172121d4b7b,
  title = {Potent tetrapeptide enkephalins.},
  author = {R E Chipkin and D H Morris and M G English and J D Rosamond and C H Stammer and E J York and J M Stewart},
  year = {1981},
  doi = {10.1016/0024-3205(81)90384-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/7242245/},
  note = {Source identifier: 7242245}
}