@misc{indiciae2870bba09a84,
  title = {Positional information and the spatial pattern of cellular differentiation.},
  author = {L Wolpert},
  year = {1969},
  doi = {10.1016/s0022-5193(69)80016-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4390734/},
  note = {Source identifier: 4390734}
}