In still another aspect, {TAIL ~ the invention} is directed to an impermeable active agent delivery system for delivering {HEAD ~ an active agent} that is susceptible to degradation 
In still another aspect , { TAIL ~ the invention } is directed to an impermeable active agent delivery system for delivering { HEAD ~ an active agent } that is susceptible to degradation
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH