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Endomorphins (EM1, H-Tyr-Pro-Trp-Phe-NH 2 and EM2, H-Tyr-Pro-Phe-Phe-NH 2 ) were isolated from bovine brain, and these flexible tetrapeptides are highly potent and selective ligands for the μ-opioid receptor. We have explored the Φ 2 –Ψ 2 and Φ 2 –Ψ 1 conformational spaces of all four types of EMs (neutral or charged N-terminal amino groups, cis or trans...
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