The invention is directed to an oral biological preparation for specific delivery in {HEAD ~ colon}, especially an oral insulin preparation for {TAIL ~ specific delivery} in colon 
The invention is directed to an oral biological preparation for specific delivery in { HEAD ~ colon } , especially an oral insulin preparation for { TAIL ~ specific delivery } in colon
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH