@misc{indiciae5e76b28ec387,
  title = {Sonic hedgehog is essential to foregut development.},
  author = {Y Litingtung and L Lei and H Westphal and C Chiang},
  year = {1998},
  doi = {10.1038/1717},
  url = {https://pubmed.ncbi.nlm.nih.gov/9731532/},
  note = {Source identifier: 9731532}
}