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