Figure 7.
Morphological change of PLGA microspheres during in vitro degradation. (A1–A3) 1 week; (B1–B3) 3 weeks; (C1–C3) 5 weeks; (D1–D3) 7 weeks; and (E1–E3) 9 weeks. The arrows point to PLGA microspheres with holes.
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