The practitioner of ordinary skill in {HEAD ~ the art} will recognize that {TAIL ~ slight deviations} of the amino acid sequences may be made without significantly affecting the efficacy of the protein 
The practitioner of ordinary skill in { HEAD ~ the art } will recognize that { TAIL ~ slight deviations } of the amino acid sequences may be made without significantly affecting the efficacy of the protein
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH