Figure 2.

Representative graph of the included studies presented in the articles reviewed. (A) Publication year of included studies (range from 2015 to 2020). (B) Target disease of included studies (include bone fracture, OA, muscle damage, tendon injury). (C) Experimental model of included studies (including mice model, rat model, in vitro experiment only). (D) Paracrine factors (including extracellular vesicle, exosomes, CM). (E) Cell source of included studies (including human, C57Bl/6 mice, other genotype mice, SD rat, cell line).