Figure 3: Histology and immunohistochemical expression of dopamine receptor subtype 2, insulin and chromogranine A (CGA) in tumor cells. a) well differentiated neuroendocrine tumor (hematoxylin and eosin, 40x magnification); b) dopamine receptor subtype 2 strongly stained cell membrane while a weaker immunostaining was found at the cytoplasmic level (40x magnification); c) insulin and d) chromogranine A strongly stained tumor cells (40x magnification).