PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 22891249-5 2012 Copper ions as well as added hydrogen peroxide are found to oxidize the methionine residue, but notably, this oxidative modification occurs only in the aggregated HTT but not in the soluble state. Hydrogen Peroxide 29-46 huntingtin Homo sapiens 163-166