Improved skin regeneration by electrospun fibers with plasmid bFGF polyplex. (A) The representative images of skin wounds after treatment with Fb2 (pbFGF polyplex, blend), Fa2 (without pbFGF) and Fa2 + Polyplex (pbFGF polyplex infiltrated Fa2) fibrous mats for 1, 2, 3, and 4 weeks, using untreated wound as control. Bars represent 10 mm. (B) Wound areas at different time points after treatment (n = 10). Reprinted with permission from . Copyright 2012 American Chemical Society.