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