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