PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16634581-13 2006 The coordination environment around the bridging Co(II) ion contains four oxygen (two P-O units, one chelating nitrate) and two nitrogen atoms (pyridyloxy nitrogens). Nitrates 111-118 mitochondrially encoded cytochrome c oxidase II Homo sapiens 49-55