Unfortunately, discrepancies among recent reports have added to the general uncertainty as to the true enzymatic function for {HEAD ~ this family} of {TAIL ~ proteins} 
of
Unfortunately , discrepancies among recent reports have added to the general uncertainty as to the true enzymatic function for { HEAD ~ this family } of { TAIL ~ proteins }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL