PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18457825-8 2008 These results suggest that harman and norharman inhibit dopamine biosynthesis by reducing TH activity and enhance L-DOPA-induced cytotoxicity in PC12 cells. norharman 38-47 tyrosine hydroxylase Rattus norvegicus 90-92