Figure 9

(A) Cell viability using MTT assay, while (B–D) SEM micrographs of HFB4 cells after 24 h seeded on CNF/PVA, CNF/PVA/PE1, and CNF/PVA/PE2 fiber-reinforced hydrogels, respectively. (*) means p less than 0.05 and **p more than 0.05 compared to the control.