Fig. 1

Cell seeding on the PLGA@PLL scaffold. A Wharton’s jelly was harvested in pieces from the human umbilical cord. B MSCs were cultured from Wharton’s jelly tissues and displayed a spindle-like shape. C SEM image of PLGA@PLL scaffold prepared using electrospinning technique. D A magnified SEM image of PLGA@PLL scaffold with a fibrous structure. E hUC-MSCs were incubated on the unmodified PLGA scaffold. F hUC-MSCs were incubated on the PLGA@PLL scaffold