{TAIL ~ Class} of {HEAD ~ the antibody}, thereafter, becomes important according to the therapeutic need 
{ TAIL ~ Class } of { HEAD ~ the antibody } , thereafter , becomes important according to the therapeutic need
TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH