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Figure 3: Transmission electron microscopy after 4 weeks of nerve injury: (a) CG—normal myelinated (M) and unmyelinated (arrows) fibers (mag: ×6.000). (b) CG—detailed image of the Schwann cell nucleus (N) involving a myelin nerve fiber (M) (mag: ×20.000). (c) EG—grouping of myelinated fibers (M) and a few unmyelinated fibers (arrows) (mag: ×2.000). (d) EG—detailed image of the axoplasm of the myelin fiber (*) with mitochondria (arrowheads) (mag: ×12.000). (e) IG—area of degeneration of nerve fibers (thin arrows) below the capillary blood and spaces among the nerve fibers (**) (mag: ×3.000). (f) IG—detailed image of the degenerating nerve fibers area (**), intact myelinated fibers (M), and linear structures that indicate Schwann cell degeneration (thin arrows) (mag: ×6.000). (g) LG—myelinated fibers (M) and degenerated Schwann cells (thin arrow) (mag: ×2.500). (h) LG—detailed image of the axoplasm of intact myelinated fibers (*) containing mitochondria (arrowheads) and remnants of Schwann cells (thin arrow) (mag: ×6.000). (i) PG—myelinated (arrowheads) and unmyelinated fibers (arrows) amid areas of degeneration (thin arrows) (mag: ×1.800). (j) PG—detailed image of myelinated fibers enveloped by Schwann cell cytoplasm containing mitochondria (arrows) and degeneration adjacent area (thin arrow) (mag: ×7.000). (k) LPG—grouping of myelinated fibers (arrows) and adjacent fibroblasts (arrowheads) in the perineural region (mag: ×1.800). (l) LPG—detailed image of a degenerated area among nerve fibers (**) adjacent to Schwann cells (arrows) (mag: ×5.600).