PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15733348-4 2004 When histamine and the HR3 agonist, methylhistamine, were applied to the same cells in succession, their effects were sometimes different, a finding suggesting that at least one other histamine receptor is present. Methylhistamines 36-51 Heart rate QTL 3 Rattus norvegicus 23-26