PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 29042516-5 2017 The fraction of cellular Mn2+ present as H-complexes (H-Mn2+), as measured by EPR of live, nonirradiated Mn-replete cells, is now the strongest known gauge of biological IR resistance between and within organisms representing all three domains of life: Antioxidant H-Mn2+ complexes, not antioxidant enzymes (e.g., Mn superoxide dismutase), govern IR survival. h-mn2+ 54-60 superoxide dismutase 2 Homo sapiens 314-337