Which are the different homologs or family members of the hedgehog proteins in mammals?
Hedgehog (Hh) signaling proteins stimulate cell proliferation, differentiation, and tissue patterning at multiple points in animal development. A single Hh homolog is present in Drosophila, but three Hh homologs, Sonic hedgehog (Shh), Indian hedgehog (Ihh) , and Desert hedgehog (Dhh), are present in mammals.