If desired, the DMSO or ethanol can be washed out of the system, leaving {HEAD ~ an aqueous gel} containing {TAIL ~ the small drug particles} 
containing
If desired , the DMSO or ethanol can be washed out of the system , leaving { HEAD ~ an aqueous gel } containing { TAIL ~ the small drug particles }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL