| CS | chitosan |
| GO | graphene oxide |
| rGO | reduced graphene oxide |
| GO-PEG | poly(ethylene glycol) grafted graphene oxide |
| HAp | hydroxyapatite |
| PBS | phosphate buffered saline |
| SBF | simulated body fluid |
| hUC-MSCs | human umbilical cord Wharton’s jelly mesenchymal stem cells |
| TPP | sodium tripolyphosphate |
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