– ?-Amyloid (25-35) (Amyloid beta-peptide (25-35), A?25-35, ?-Amyloid peptide (25-35)) , a sequence GSNKGAIIGLM, is a highly toxic synthetic derivative of Amyloid beta-peptide (A?-peptides) which forms fibrillary aggregates. ?-Amyloid (25-35) is involved in the pathogenesis of Alzheimer’s disease.