From Popular Science.

The Sonic Hedgehog protein (SHH) is an integral part of making your body what it is… seriously.

Sonic Hedgehog plays a role in forming your brain, central nervous system, lungs, digits, and limbs — because you need limbs when you gotta go fast.

And the inhibitor to the Sonic Hedgehog protein? Robotnikinin.

YES, THIS IS ALL REAL: https://en.wikipedia.org/wiki/Sonic_hedgehog_protein

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