The nucleic acid 1, having {HEAD ~ C terminal mutations} at {TAIL ~ positions} 1010 and 1011 
The nucleic acid 1 , having { HEAD ~ C terminal mutations } at { TAIL ~ positions } 1010 and 1011
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH