@misc{indiciaed66d53084239,
  title = {Morphine alters preproenkephalin gene expression.},
  author = {G R Uhl and J P Ryan and J P Schwartz},
  year = {1988},
  doi = {10.1016/0006-8993(88)90658-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/3179713/},
  note = {Source identifier: 3179713}
}