Naloxone benzoylhydrazone (NalBzoH) is a ligand used to study opioid receptors. It has been suggested to act at a novel kappa3 receptor but also appears to bind to classical opioid receptors, and possibly the ORL1 receptor. We have used opioid receptor triple knockout mice, deficient in genes coding for the mu, delta and kappa-receptor, to characterise the relative contributions of opioid and ORL1 activity to the binding of this ligand, by carrying out receptor autoradiography with [3H]NalBzoH.
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