Fig. 2From: Insulinoma presenting as hypoglycemia during lactose tolerance testing: a case reportImmunohistochemistry of resected tumor showing pancreatic cells staining for (a) synaptophysin, (b) chromogranin A, (c) insulin, and (d) Ki-67. Neoplastic cells stained strongly positive for synaptophysin, chromogranin A, and insulin. The Ki-67 proliferative index was 3%Back to article page