Morphological observation of HDFs in different treatment groups
(A) Control group HDFs (200×); (B) control group HDFs cultured for 24 h (200×); (C) HDFs after 20 J/cm2 UVA exposure (200×); (D) UVA group HDFs cultured for 24 h (200×); and (E) CGF group HDFs cultured for 24 h (200×).