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