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