PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16285826-5 2005 Under acidic conditions, where electrostatic repulsion existed between the neighboring protonated amine moieties of the polyallylamine main chain, the rapid aggregation of the poly(l-leucine) graft chains was disturbed, and the peptide graft chains formed a beta-sheet structure owing to the intramolecular hydrogen bonding among the graft chains. polyallylamine 120-134 amyloid beta precursor protein Homo sapiens 256-262