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