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.
Sonic hedgehog er det bedste eksempel på en morphogen som defineret af Lewis Wolpert Franske flag model—et molekyle der diffusioners så der dannes en koncentrations gradient der har forskellig effekter på celler i det udviklende embryo afhængig af dets koncentration.