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Morphology of the drug-free microspheres (MS) (A–E) and the microspheres (MS) loaded with epothilone B (EpoB) and rapamycin (Rap) (A1–E1), obtained from PLA 100/PLA–PEG 0 (A,A1), PLA 75/PLA–PEG 25 (B,B1), PLA 50/PLA–PEG 50 (C,C1), PLA 25/PLA–PEG 75 (D,D1), PLA 0/PLA–PEG 100 (E,E1).
