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