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SEM micrographs of different electrospun nanofibers. (a) Electrospun PCL nanofiber [50]. (b) Electrospun-aligned PLGA nanofiber [51]. (c) Electrospun-aligned PLGA/gelatin nanofiber [51]. (d) Electrospun PLA nanofiber [52]. (e) Electrospun silk fibroin-gelatin nanofiber (50 : 50) [52]. (f) Electrospun silk fibroin-gelatin nanofiber (70 : 30) [52].
