Figure 3From: Neuroendocrine tumors of the gallbladder: a case report and review of the literature Tumor cells did not express cytokeratin (A), vimentin (B), CD-31 (C), or CD-34 (D), as revealed by immunohistochemistry. Endothelial cells positive for CD-31 (C) and CD-34 (D). Magnification: ×20.Back to article page