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