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 b-secretase beta-secretase g-secretase gamma-secretase structure peptide amino acid molecule polypeptide polymer atoms science scientific health molecular model 3d rendering illustration