“…The synthetic polymers include polylactic acid (PLA), polyglycolic acid (PGA), poly (lactic-co-glycolic acid) (PLGA), and poly-e-caprolactone (PCL), while the natural polymers include proteins and polysaccharides ( Janoušková, 2018 ; Rao et al, 2018 ). Compared with synthetic polymers, natural polymers such as collagen, fibrin, silk protein, chitosan, and hyaluronic acid generally present better biocompatibility but limited processability ( Naghieh et al, 2017 ; Caillol, 2020 ; Taghipour et al, 2020 ). With the rapid development of processing technology in recent years, more natural polymer-based scaffolds have been successfully fabricated and applied in biomedical applications.…”