![Holoprosencephaly - a condition which causes hideous birth defects - is usually caused by a mutation in Sonic the Hedgehog gene (yes, that's its scientific name) : r/TerrifyingAsFuck Holoprosencephaly - a condition which causes hideous birth defects - is usually caused by a mutation in Sonic the Hedgehog gene (yes, that's its scientific name) : r/TerrifyingAsFuck](https://i.redd.it/k5mm76pb754c1.jpg)
Holoprosencephaly - a condition which causes hideous birth defects - is usually caused by a mutation in Sonic the Hedgehog gene (yes, that's its scientific name) : r/TerrifyingAsFuck
![File:Holoprosencephaly flattened forehead fetus 14 weeks US by Dr. W. Moroder.jpg - Wikimedia Commons File:Holoprosencephaly flattened forehead fetus 14 weeks US by Dr. W. Moroder.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/Holoprosencephaly_flattened_forehead_fetus_14_weeks_US_by_Dr._W._Moroder.jpg/1024px-Holoprosencephaly_flattened_forehead_fetus_14_weeks_US_by_Dr._W._Moroder.jpg)
File:Holoprosencephaly flattened forehead fetus 14 weeks US by Dr. W. Moroder.jpg - Wikimedia Commons
![Patched is a 12 pass transmembrane receptor: Patched is the receptor for the key signaling protein Hedgehog. - ppt download Patched is a 12 pass transmembrane receptor: Patched is the receptor for the key signaling protein Hedgehog. - ppt download](https://images.slideplayer.com/26/8350802/slides/slide_5.jpg)