@misc{indiciae3cc27117fc08,
  title = {BMP signalling: synergy and feedback create a step gradient.},
  author = {Hilary L Ashe},
  year = {2005},
  doi = {10.1016/j.cub.2005.05.003},
  url = {https://pubmed.ncbi.nlm.nih.gov/15916937/},
  note = {Source identifier: 15916937}
}