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Vošahlíková, M., Jurkiewicz, P., Roubalová, L. et Al. (2014), High- and low-affinity sites for sodium in δ-OR-Gi1α (Cys351-Ile351) fusion protein stably expressed in HEK293 cells; functional significance and correlation with biophysical state of plasma membrane. Naunyn-Schmiedebergs Arch Pharmacol, 387: 487. Bourova, L., Kostrnova, A., Hejnova, L., Moravcova, Z., Moon, H.-E., Novotny, J., Milligan, g. and Svoboda, P. (2003), δ-Opioid receptors exhibit high efficiency when activating trimeric g proteins in membrane domains. Journal of Neurochemistry, 85: 34–49.