{HEAD ~ The peptides} comprise {TAIL ~ fragments} of host cell proteins that have been targeted for degradation by HPV proteins, such as E6 and E7 
comprise
{ HEAD ~ The peptides } comprise { TAIL ~ fragments } of host cell proteins that have been targeted for degradation by HPV proteins , such as E6 and E7
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH