390 5HT1B_HORSE Serotonin receptor 1B 5-hydroxytryptamine receptor 1B HTR1B This is one of the several different receptors for 5- hydroxytryptamine (serotonin), a biogenic hormone that functions as a neurotransmitter, a hormone, and a mitogen. The activity of this receptor is mediated by G proteins that inhibit adenylate cyclase activity (By similarity). MEETGAQCAPPPPAGSQTGVSQVNLSAAPSHNCSTEGYVYQDSVALPWKVLLVVLLALITLATTLSNAFVIATVYRTRKLHTPANYLIASLAVTDLLVSILVMPISTMYVVTGRWTLGQVVCDFWLSSDITCCTASILHLCVIALDRYWAITDAVEYSAKRTPKRAAVMIALVWVFSISISLPPFFWRQAKAEEEVLDCLVNTDHILYTVYSTVGAFYFPTLLLIALYSRIYVEARSRILKQTPNRTGKRLTRAQLMTDSPGSTSSVTSINSRAPDVPSESGSPVYVNQVKVRVSDALVEKKKLMAARERKATKTLGIILGAFIVCWLPFFIISLVMPICKDACWFHLAIFDFFTWLGYLNSLINPIIYTMSNEDFKQAFHKLIRFKCAS