- (biochemistry) A morphogenic protein that controls cell division of adult stem cells and has been implicated in the development of some cancers.
- Sometimes capitalized as Sonic hedgehog.
This word is usually not inflected, as it would be difficult to fit into any Finnish declension category. If there's a need to inflect sonic hedgehog, it is combined with something inflectable such as proteiini (“protein”) or molekyyli (“molecule”), e.g. sonic hedgehog-molekyyli.