Fig. 3From: Extracellular matrix derived from human urine-derived stem cells enhances the expansion, adhesion, spreading, and differentiation of human periodontal ligament stem cellsThe effects of different substrates on the proliferation of hPDLSCs according to a CCK-8 assay. All values indicate the mean ± SD; *p < 0.05 and **p < 0.01Back to article page