Sonic the Hedgehog (character) Sonic the Hedgehog (character) Sonic the Hedgehog is the title character and protagonist of the "Sonic the Hedgehog" video game series released by Sega, as well as numerous spin-off comics, animations, and other media. Sonic is a blue anthropomorphic hedgehog who can run at supersonic speeds and curl into a ball, primarily to attack enemies. Throughout the course of the video games, Sonic most commonly has to race through levels, collect power up rings and survive against a host of natural obstacles and minions to achieve his goal. While many individuals at Sega had a hand in Sonic's creation, programmer
Sonic hedgehog of prostate cancer tumours. For SHH to be expressed in the developing embryo limbs, a morphogen called fibroblast growth factors must be secreted from the apical ectodermal ridge. Sonic hedgehog has also been shown to act as an axonal guidance cue. It has been demonstrated that SHH attracts commissural axons at the ventral midline of the developing spinal cord. Specifically, SHH attracts retinal ganglion cell (RGC) axons at low concentrations and repels them at higher concentrations. The absence (non-expression) of SHH has been shown to control the growth of nascent hind limbs in cetaceans (whales and dolphins). The sonic hedgehog