@misc{indiciaed22910734fb9,
  title = {Positional information in chick limb morphogenesis.},
  author = {D Summerbell and J H Lewis and L Wolpert},
  year = {1973},
  doi = {10.1038/244492a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4621272/},
  note = {Source identifier: 4621272}
}