Abstract: This invention provides isolated nucleic acid molecules encoding human 5-HT.sub.1D receptors, isolated proteins which are human 5-HT.sub.1D receptors, vectors comprising isolated nucleic acid molecules encoding human 5-HT.sub.1D receptors, mammalian cells comprising such vectors, antibodies directed to the human 5-HT.sub.1D receptors, nucleic acid probes useful for detecting nucleic acid encoding human 5-HT.sub.1D receptors, antisense oligonucleotides complementary to any sequences of a nucleic acid molecule which encodes a human 5-HT.sub.1D receptor, pharmaceutical compounds related to human 5-HT.sub.1D receptors, and nonhuman transgenic animals which express DNA a normal or a mutant human 5-HT.sub.1D receptor. This invention further provides methods for determining ligand binding, detecting expression, drug screening, and treatment involving the human 5-HT.sub.1D receptor.

Abstract: The present invention provides an isolated nucleic acid molecule encoding an .alpha..sub.2B -adrenergic receptor, and an isolated protein which is a human .alpha..sub.2B -adrenergic receptor.The invention also provides vectors comprising DNA molecules encoding a human .alpha..sub.2B -adrenergic receptor, and vectors adapted for expression of the .alpha..sub.2B -adrenergic receptor in bacterial, yeast, or mammalian cells.In addition, the invention provides a DNA probe useful for detecting nucleic acid encoding the .alpha..sub.2B -adrenergic receptor, a method for determining whether a ligand which is not known to be capable of binding to the .alpha..sub.2B -adrenergic receptor can bind to the .alpha..sub.2B -adrenergic receptor, a method for detecting the presence of .alpha..sub.2B -adrenergic receptor on the surface of a cell, and a method of screening drugs to identify drugs which specifically interact with, and bind to, the .alpha..sub.2B -adrenergic receptor.