571394.fig.002a
(a)
571394.fig.002b
(b)
571394.fig.002c
(c)
571394.fig.002d
(d)
Figure 2: Representative nanoscale systems used for administering drugs: (a) liposome with drug inclusions in the aqueous fluid and bilayer, (b) liposome with targeting ligands and PEG, (c) polymer micelles, and (d) dendrimer.