Sonic hedgehog

Sonic hedgehog homolog (SHH) is one of three proteins in the mammalian hedgehog family, the others being desert hedgehog (DHH) and Indian hedgehog (IHH). SHH is the best studied ligand of the hedgehog signaling pathway. It plays a key role in regulating vertebrate organogenesis, such as in the growth of digits on limbs and organization of the brain. Sonic hedgehog is the best established example of a morphogen as defined by Lewis Wolpert's French flag model - a molecule that diffuses to form a concentration gradient and has different effects on the cells of the developing embryo depending on its concentration. SHH remains important in the adult. It controls cell division of adult stem cells and has been implicated in development of some cancers.
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This is the version of the character seen in the video game series and television shows. For information on how he appears in the Archie comics, see Sonic the Hedgehog (comic character). , trademarked Sonic The Hedgehog, is a video game character and the hero of a video game series released by Sega, as well as numerous spin-off comics, cartoons and books. The first game in the franchise was released on June 23, 1991 in order to provide Sega with a mascot to rival Nintendo's flagship character Mario (see 1991 in video gaming). Since then, Sonic has become one of the world's best-known video game characters, with his series having sold over 45 million copies. In 2005, Sonic was one of the first game character inductees into the Walk of Game, alongside Mario and Link.
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