PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 17503819-6 2007 To further validate the direct interaction model we show that, in urea and guanidinium chloride solutions, unfolding of an unusually stable helix (H1) from mouse PrPC (residues 144-153) occurs by hydrogen bonding of denaturants to charged side chains and backbone carbonyl groups. Hydrogen 196-204 prion protein Mus musculus 162-166