216137.fig.001a
(a) poly-4-hydroxybutyrate
216137.fig.001b
(b) polyglycolide
216137.fig.001c
(c) polycaprolactone
Figure 1: Chemical structures of (a) poly-4-hydroxybutyrate (P4HB), (b) polyglycolide, and (c) ε-polycaprolactone.