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

Figure 6 Immunohistochemical detection of type IV collagen in a section of the second part of the biopsy that was investigated in this study (section adjacent to the one shown in Figure 4; counterstaining was performed with Mayer's hematoxylin). A: Low-power overview (insets, position of the high-power photomicrographs displayed in Panels B-G); B: Position of degenerative tendon tissue with formation of microvessels (black arrows, immunolabeling for type IV collagen in the basement membrane of microvessels); C: position of degenerative tendon tissue without formation of microvessels; D: Position of a spot with very high density of cells and microvessels (black arrows, immunolabeling for type IV collagen in the basement membrane of microvessels); E: Position of tendon tissue in the depth of the biopsy (black arrows, immunolabeling for type IV collagen in the basement membrane of microvessels); F: Position of tendon tissue below an outer surface of the biopsy (black arrows, immunolabeling for type IV collagen in the basement membrane of microvessels); G: Position of tendon tissue at an outer surface of the biopsy (black arrow, immunolabeling for type IV collagen in the basement membrane of microvessels).