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