beta-amyloid (abeta) peptide, 3d rendering. major component of p

beta amlyoid abeta alzheimer alzheimers disease precursor neuritic plaque aggregated aggregation protein helix helical app neurotoxic brain deposit fiber fold folding misfolding oligomer bsecretase betasecretase gsecretase gammasecretase structure peptide amino acid molecule polypeptide polymer atoms science scientific health molecular model 3d rendering illustration