As discussed above, the most critical factor to {HEAD ~ antibody production} is specificity to {TAIL ~ a desired antigen} or epitope on an antigen 
As discussed above , the most critical factor to { HEAD ~ antibody production } is specificity to { TAIL ~ a desired antigen } or epitope on an antigen
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH