PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2023255-1 1991 Human liver manganese superoxide dismutase has been purified by a short procedure that includes a tri-phase partitioning step to provide materials that can be crystallized from ammonium sulfate. Ammonium Sulfate 177-193 superoxide dismutase 2 Homo sapiens 12-42