{HEAD ~ The liposomes} are formed under {TAIL ~ conditions} that distribute the polymer on both sides of the liposomes bilayer membranes 
are formed under
{ HEAD ~ The liposomes } are formed under { TAIL ~ conditions } that distribute the polymer on both sides of the liposomes bilayer membranes
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH