Sonic Hedgehog (Shh) is expressed in critical embryonic tissues, aiding in the development of the central nervous system, somites, and limbs. Shh-N is highly conserved, sharing over 98% amino acid identity among various species. The Hedgehog (Hh) family of secreted proteins plays a crucial role in metazoan development, with defects leading to congenital abnormalities and certain cancers. Shh, the most widely expressed ligand, is key to understanding vertebrate Hh signaling, though it has unique features compared to the DrosophilaHh pathway.