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PMID: 8011338 

Hashimoto H, Ishihara T, Shigemoto R, Mori K, Nagata S.10.1016/0896-6273(93)90188-W__Molecular cloning and tissue distribution of a receptor for pituitary adenylate cyclase-activating polypeptide. Neuron. 1993;11(2):333-342. doi:10.1016/0896-6273(93)90188-W
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Tanabe Y, Masu M, Ishii T, Shigemoto R, Nakanishi S. A family of metabotropic glutamate receptors. Neuron. 1992;8(1):169-179. doi:10.1016/0896-6273(92)90118-W
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Ishihara T, Shigemoto R, Mori K, Takahashi K, Nagata S. Functional expression and tissue distribution of a novel receptor for vasoactive intestinal polypeptide. Neuron. 1992;8(4):811-819. doi:10.1016/0896-6273(92)90101-I
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PMID: 1314625