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