PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23243667-4 2013 The Me2Cyclen base is always involved in the coordination of the transition metal cation with the four amine functions; both side-arms bind Co(II) while only one of them binds Cu(II). Metals 76-81 mitochondrially encoded cytochrome c oxidase II Homo sapiens 140-146