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We also used BRET methodology to assess the association of prokineticin receptors with β-arrestin isoforms. Fluorescent versions of the isoforms were transfected both in HEK293 cells and in double KO β-arrestin 1/2 mouse fibroblasts, to study receptor interaction with the reconstituted individual β-arrestins without background expression of the endogenous genes. Both receptors formed stable BRET-emitting complexes with β-arrestin 2 but not with β-arrestin 1, indicating strong selectivity for the former. In all the studied transducer in