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Gene expression profiles of PDL cells on the microfibers. (A) Cyclin D (CCND1). (B) E-cadherin (CDH1). (C) Periostin (POSTN). (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, f = p < 0.001).
