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Extracellular ATP acts at specific cell surface purinoceptors to elicit a wide range of physiological responses. We have recently isolated a cDNA for a G-protein-coupled P2 purinoceptor (P2y1) from chick brain. It has been defined as a P2Y-like purinoceptor by the rank order of potency of P2 purinoceptor ligands, determined electrophysiologically in the Xenopus oocyte expression system. Here, we examine the ligand selectivity of this recombinant receptor, expressed transiently in COS-7 cells. The regional distribution of the P2y1 purinoceptor transcript within the one-day-post-hatch chick brain was also determined. It is widely expressed in the cerebellum and telencephalon and in specific nuclei of the mesencephalon and diencephalon, suggesting a neuronal localization of the P21 purinoceptor.
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T E Webb, and
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Gene,
