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Behaviors of PDL cells on the microfibers. (A) The ratio of living cells. (B) Cell spreading area. (C) Cell adhesion area. (D) Aspect ratio. (Significant difference to the straight microfibers under the same loading condition at the same time point: a = p < 0.05, b = p < 0.01; significant difference to the straight microfibers without loading at the same time point: d = p < 0.05, e = p < 0.01).
