GCG and neuroblastoma: Since the deleterious effects of Aβ on neuronal cells are thought to be mediated by its oligomeric forms with increased cytotoxicity [9,79,80], we compared the cytotoxicity of Aβ40/Aβ42 alone and in the presence of GLP-1(7-37) or its analogs against human neuroblastoma SH-SY5Y cells using the MTT assay.