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Somatostatin receptor (SSTR) and CXCR4 expression pattern in hepatocellular and cholangiocellular carcinomas. Depicted are typical examples of staining patterns for SSTR1 (a, f), SSTR2 (b, g), SSTR3 (c, h), SSTR5 (d, i), and CXCR4 (e, j). Immunohistochemistry (red-brown color), counterstaining with hematoxylin; scale bar: 50 μm; arrow in G: tumor cells. With the only exception of SSTR4, all receptors displayed both membranous and cytoplasmic expression
