These previously unseen peptides/proteins may enter and associate with the empty major histocompatibility complex molecules of {HEAD ~ the surviving cells} to form {TAIL ~ non naturally occurring species} of antigen associated antigen presenting cells, which then could be tested for their ability to confer to the recipient a beneficial immune system response 
to form
These previously unseen peptides / proteins may enter and associate with the empty major histocompatibility complex molecules of { HEAD ~ the surviving cells } to form { TAIL ~ non naturally occurring species } of antigen associated antigen presenting cells , which then could be tested for their ability to confer to the recipient a beneficial immune system response
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH