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The toxicity evaluation of PU and PUSX samples. PU nanofibers (a) and films (b), Si01 nanofibers (c) and films (d), Si01-59 nanofibers (e) and films (f), Si04 nanofibers (g) and films (h), Si08 nanofibers (i) and films (j), compared to the negative control (k) and the positive control (l). (Magnification: 40×).
