PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8999946-2 1997 The peroxyl radical is shown here to be localized on tryptophan through the use of recombinant sperm whale myoglobin labeled with 13C at the indole ring C-3. Tryptophan 53-63 complement C3 Physeter catodon 153-156