PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16446494-8 2006 Although PGE2 caused a small increase in CO production, xanthine oxidase plus hypoxanthine, which produces superoxide, strongly stimulated the production of CO by cerebral microvessels. Superoxides 107-117 xanthine dehydrogenase Sus scrofa 56-72