Detoxified cobra venom and {HEAD ~ its constituent neurotoxins} have been reported to have {TAIL ~ potent antiviral activity} 
reported to have
Detoxified cobra venom and { HEAD ~ its constituent neurotoxins } have been reported to have { TAIL ~ potent antiviral activity }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL