{HEAD ~ Adjuvants} are {TAIL ~ substances} that can be used to nonspecifically augment a specific immune response 
{ HEAD ~ Adjuvants } are { TAIL ~ substances } that can be used to nonspecifically augment a specific immune response
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH