5-FAM-Amyloid-ß (1-42) peptide is a fluorescently labeled amyloid-ß peptide. Amyloid-ß (1-42) (Aß42) peptide is the primary form of Aß found in amyloid plaques in postmortem cerebral cortex from patients with Alzheimer's disease and its aggregation results in the formation of neurotoxic fibrils or globular oligomers. 5-FAM-Amyloid-ß (1-42) is a labeled form of Aß42 containing 5-carboxyfluorescein , which displays excitation/emission maxima of 492/518 nm, respectively.