PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2005584-3 1991 Caffeine may be particularly troublesome in this regard because this methylxanthine has central nervous system effects and intracellular actions that also might contribute to the overall ability of caffeine to potentiate renin secretion. methylxanthine 69-83 renin Rattus norvegicus 221-226