PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8166235-4 1994 It was inhibited by exposing the rings for 90 min either to peroxide [50% inhibitory concentration (IC50) = 0.56 +/- 0.18 mM] or to superoxide generated by xanthine oxidase (XO; 0.3 mM xanthine and xanthine oxidase, IC50 = 0.08 +/- 02 mU/ml). Superoxides 132-142 xanthine dehydrogenase Sus scrofa 156-172