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