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