In {TAIL ~ addition} to {HEAD ~ hedgehog} polypeptide, a TGF β factor may also be utilized in the method of the invention 
In { TAIL ~ addition } to { HEAD ~ hedgehog } polypeptide , a TGF β factor may also be utilized in the method of the invention
OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH