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