PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2468921-8 1989 In human ventricular membranes xamoterol stimulated marginally the adenylate cyclase and antagonized the effects of (-)-norepinephrine with a 30-fold greater affinity for beta 1- than for beta 2-adrenoceptors. Norepinephrine 116-134 potassium calcium-activated channel subfamily M regulatory beta subunit 2 Homo sapiens 188-194