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3T3 fibroblasts on PLGA nanofiber scaffolds 15 days after seeding: (A, E) nonsterilized mat; (B, F) sterilized by two pulses of ozonation; (C, G) sterilized by four pulses of ozonation; (D, H) sterilized by eight pulses of ozonation. Scale bars = 100 μm (A–D) and 10 μm (E–H).
