Summary
From brain and from pituitary tissue of vertebrates several peptides —with molecular weights between 500 and 3500 daltons — have been isolated, which behave like opiates in opiate receptor binding assays, in isolated tissue preparations and in the intact animal.
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Teschemacher, H. Endogenous ligands of opiate receptors. Naunyn-Schmiedeberg's Arch. Pharmacol. 297 (Suppl 1), S51–S52 (1977). https://doi.org/10.1007/BF00587776
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DOI: https://doi.org/10.1007/BF00587776