The devices additionally contain {HEAD ~ a surfactant erosion rate modifier} that cooperates with and interacts with {TAIL ~ polymers} for regulating the rate of erosion of the polymers 
cooperates with
The devices additionally contain { HEAD ~ a surfactant erosion rate modifier } that cooperates with and interacts with { TAIL ~ polymers } for regulating the rate of erosion of the polymers
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH