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