Of particular relevance is {HEAD ~ the marked increase} in {TAIL ~ the expression} of genes associated with the production of gamma interferon, a potent antiviral agent and regulator of the immune response 
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Of particular relevance is { HEAD ~ the marked increase } in { TAIL ~ the expression } of genes associated with the production of gamma interferon , a potent antiviral agent and regulator of the immune response
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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