One embodiment of the invention is directed to a process for {HEAD ~ the chemical modification} of {TAIL ~ organic compounds} to form immunogens 
One embodiment of the invention is directed to a process for { HEAD ~ the chemical modification } of { TAIL ~ organic compounds } to form immunogens
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH