Consideration of that question raises {HEAD ~ issues} of {TAIL ~ complement fixation} and the like, which then drives the selection of the particular class or isotype of antibody 
of
Consideration of that question raises { HEAD ~ issues } of { TAIL ~ complement fixation } and the like , which then drives the selection of the particular class or isotype of antibody
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH