@misc{indiciaea756b3ab257e,
  title = {Endogenous opioid systems in brain.},
  author = {G W Pasternak},
  year = {1980},
  doi = {10.1016/0002-9343(80)90347-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/6243856/},
  note = {Source identifier: 6243856}
}