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