Expressions of inducible nitric oxide synthase and matrix metalloproteinase-9 and their effects on angiogenesis and progression of hepatocellular carcinoma

Figure 2 Immunohistochemical staining for MMP-9. A: MMP-9 in cytoplasm and cytoplasmic membranes in HCC (×400); B: MMP-9 in vascular endothelial cells, bile ducts, HCC cells, and stromal fibroblasts (arrow heads from top to bottom) within HCC (×200); C: MMP-9 expression in neighboring capsule of HCC (×200); and D: weak expression of MMP-9 in central areas of HCC tissues (×200).