Additionally, {TAIL ~ information} from multiple experiments is utilized to improve {HEAD ~ the accuracy} of calling unknown bases 
Additionally , { TAIL ~ information } from multiple experiments is utilized to improve { HEAD ~ the accuracy } of calling unknown bases
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH