Beta-Amyloid (Aβ)• The sequence of Aβ was first discovered from the insoluble componentof amyloid plaques and congophilic angiopathy (Glenner and Wong,1984).• Aβ is a protein fragment snipped from a larger protein called amyloidprecursor protein (APP).• The APP is a transmembrane protein that can undergo a series ofproteolytic cleavage by secretase enzymes.• It was found that mutations in APP or some proteases structure cancause an inherited form of AD.38