APP (Amyloid Protein Precursor) is a cell surface receptor and transmembrane precursor protein that is cleaved by secretases to form a number of peptides. Some of these peptides are secreted and can bind to the acetyltransferase comple, Xenopus/Amphibian, APBB1/TIP60 to promote transcriptional activation, whereas others form the protein basis of the amyloid plaques found in the brains of patients with Alzheimer disease. Mutations in this gene have been implicated in autosomal dominant Alzheimer disease and cerebroarterial amyloidosis (cerebral amyloid angiopathy). In addition, APP is associated with neurological disorders related to type II diabetes and Down's syndrome.