The three mammalian hedgehog ligands – desert (Dhh), indian (Ihh) and sonic (Shh) have distinct patterns of expression; only Shh is broadly expressed in many tissues. The genes are listed with aliases in parentheses, full names and links to gene report pages:
Dhh (HHg-3) – desert hedgehog
Ihh (BDA1, HHG2) – indian hedgehog
Shh (TPT, HHG1, HLP3) – sonic hedgehog





















