Figure 1. Immunohistochemistry staining of formalin-fixed, paraffin-embedded human kidney tissue. Each specimen consisted of normal tissue adjacent to renal cell carcinoma (RCC) tissue. Each section was immunohistochemically stained with antibodies for cystathionine γ-lyase (CSE), cystathionine β-synthase (CBS), and 3-mercaptopyruvate sulfurtransferase (MPST). All images were taken at 10× magnification using bright-field microscopy.