First immunohistochemical evidence of human tendon repair following stem cell injection: A case report and review of literature

Figure 4 Histological analysis of a representative section of the second part of the biopsy that was investigated in this study (section stained with Azan trichrome stain; cells are in red and collagen is in blue). A: Low-power overview (insets, position of the high-power photomicrographs displayed in Panels B-G); B: Degenerative tendon tissue with formation of microvessels (black arrows, blood cells); C: Degenerative tendon tissue without formation of microvessels (black arrows, rounded cells); D: Spot with very high density of cells and microvessels; E: Tendon tissue in the depth of the biopsy (yellow arrows, elongated, fibroblast-like cells (tenocytes) arranged in long and parallel chains between collagen fibers); F: Tendon tissue below an outer surface of the biopsy (yellow arrows, elongated, fibroblast-like cells (tenocytes) arranged in long and parallel chains between collagen fibers); G: Tendon tissue at an outer surface of the biopsy (yellow arrows, elongated, fibroblast-like cells (tenocytes) arranged in long and parallel chains between collagen fibers).