PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2840023-0 1988 Electron paramagnetic resonance study on crosslinked asymmetric Fe(II)-Co(II) hybrids of hemoglobin. ammonium ferrous sulfate 64-70 mitochondrially encoded cytochrome c oxidase II Homo sapiens 71-77