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(A) SEM micrographs of nanohydroxyapatite/collagen/chitosan fibres; scale bar: 1 µm (B) Induced pluripotent stem-cell-derived mesenchymal stem cells (iPSC-MSCs) seeded on HA/chitosan fibres after culturing for 4 days, scale bar: 20 µm (Xie et al., 2016) [142]; (Adapted with permission of publisher).
