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