{TAIL ~ The invention} also provides a method for modulating proliferation or differentiation of neuronal cells comprising contacting {HEAD ~ the cells} with a hedgehog polypeptide 
{ TAIL ~ The invention } also provides a method for modulating proliferation or differentiation of neuronal cells comprising contacting { HEAD ~ the cells } with a hedgehog polypeptide
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH