@misc{indiciae0e94a397958d,
  title = {Positional signalling along hydra.},
  author = {L Wolpert and M R Clarke and A Hornbruch},
  year = {1972},
  doi = {10.1038/newbio239101a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4507514/},
  note = {Source identifier: 4507514}
}