A method of preparing the polypeptide, said {TAIL ~ method} comprising {HEAD ~ the steps} of: 
A method of preparing the polypeptide , said { TAIL ~ method } comprising { HEAD ~ the steps } of :
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH