In {TAIL ~ addition}, {HEAD ~ a greater immune response}, as measured by antibody production, is achieved using a controlled release vaccine 
In
In { TAIL ~ addition } , { HEAD ~ a greater immune response } , as measured by antibody production , is achieved using a controlled release vaccine
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH