Figure 7: Ultrastructural changes one month after fractional RF application at a lower magnification. Well-developed rough endoplasmic reticula can be seen within the fibroblast (FB), suggestive of active protein synthesis and collagenesis. Bundles of collagen fibers surround the fibroblast (col). The elastic fibers (EF) appear to be more-or-less normal, without showing excessive elastin deposition. (Scale bar, 2 μm).