Thomsen, C L-2-amino-4-phosphonobutyrate (L-AP4) is an agonist at the type IV metabotropic glutamate receptor which is negatively coupled to adenylate cyclase. [electronic resource] - European journal of pharmacology Nov 1992 - 361-2 p. digital Publication Type: Journal Article ISSN: 0014-2999 Standard No.: 10.1016/0922-4106(92)90018-q doi Subjects--Topical Terms: Adenylyl Cyclases--metabolismAminobutyrates--pharmacologyAnimalsCells, CulturedColforsin--pharmacologyCricetinaeCyclic AMP--metabolismGlutamates--pharmacologyGlutamic AcidKidney--cytologyReceptors, Glutamate--drug effects