After introducing these antibody genes in the host cells, {HEAD ~ cells} expressing {TAIL ~ the antibody} can be identified and selected 
After introducing these antibody genes in the host cells , { HEAD ~ cells } expressing { TAIL ~ the antibody } can be identified and selected
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH