It is understood that {HEAD ~ some forms} of the protein may have additional N terminal amino acids which may occur, for example, as a result of incomplete processing or hydrolysis of {TAIL ~ the signal sequence} 
It is understood that { HEAD ~ some forms } of the protein may have additional N terminal amino acids which may occur , for example , as a result of incomplete processing or hydrolysis of { TAIL ~ the signal sequence }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL