Sonic hedgehog

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This article is about the gene Sonic hedgehog. For the charater, see Sonic the Hedgehog. For eponymous media see Sonic the Hedgehog (disambiguation).

Sonic hedgehog homolog is one of three proteins in the mammalian hedgehog family. The protein is actually named after Sonic the Hedgehog, and the name was used because there are only two types of hedgehogs, and three hedgehog protein types, so they used Sonics name for the third one.