PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 1578282-7 1992 We conclude that 5-HT activates presynaptic 5-HT1B receptors that inhibit the release of GABA onto GABAB but not GABAA receptors. gabab 99-104 5-hydroxytryptamine receptor 1B Rattus norvegicus 44-50