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