Immunohistochemistry of OPN staining in Paraffin Sections of synovial tissue of pigmented villonodular synovitis (PVNS) patients. Section was incubated with OPN antibody Cat.-No AP02135SU (1/200) for 60 min at RT and detected using streptavidin biotin technique. Fast red substrate was used as chromogen. The section was counterstained with haematoxylin. D: OPN antibody Cat.-No AP02135SU stains proliferating synovial cells. Original magnification: x7.8 Geldyyev A et al. (2007) Cancer Letters 255 (2): 275-283.