Novel polypeptides are provided having dopaminergic receptor activity and containing the 400-aminoacid sequence of figure 1 or a fragment thereof, said fragment being such that: either it nevertheless contains the sites included in the sequence and whose presence is required if, when said fragment is exposed on the surface of a cell, it is specifically and quantitatively to bond the dopamine, its agonists or its antagonists, for example by means of a radioactive ligand; or it may be recognized by antibodies which also recognize the abovementioned sequence of 400 aminoacids but do not recognize either the D-1 dopaminergic receptor, the D-2 dopaminergic receptor or the rat D-3 receptor; or else it may generate antibodies which recognize the abovementioned sequence of 446 aminoacids but do not recognize either the D-1 dopaminergic receptor, the D-2 dopaminergic receptor, or the rat D-3 receptor.
POLYPEPTIDES HAVING HUMAN DOPAMINERGIC RECEPTOR ACTIVITY, NUCLEIC ACIDS CODING FOR SAID POLYPEPTIDES AND USES THEREOF FOR SCREENING ACTIVE SUBSTANCES ON SAID POLYPEPTIDES