PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 25587028-7 2014 Similarly, exposure of melanoma cells to shikonin, a menadione analog and a potential PKM2 inhibitor, is sufficient to induce ferroxitosis under hypoxic conditions. shikonin 41-49 pyruvate kinase M1/2 Homo sapiens 86-90