Examples of {HEAD ~ active agents} include a paramagnetic element, a radioactive element and {TAIL ~ a fibrinolytic agent}, among others 
Examples of { HEAD ~ active agents } include a paramagnetic element , a radioactive element and { TAIL ~ a fibrinolytic agent } , among others
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH