@misc{indiciae6efc7e13d16b,
  title = {Has morphine a physiological function in the animal kingdom?},
  author = {H W Kosterlitz},
  doi = {10.1038/317671a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/2997618/},
  note = {Source identifier: 2997618}
}