The antibody labels Glial Fibrillary Acidic Protein (GFAP) and is a useful tool for the identification of astrocytes in the CNS under normal and pathological conditions. In stomach, G-cells show a moderate to strong cytoplasmic staining, whereas epithelial cells are negative. Cytoplasmic staining is observed in neoplastic cells of gastrin-secreting neuroendocrine tumors. This antibody may be useful in the identification of gastric neuroendocrine tumors when used in a panel of antibodies.