Western blot was performed as previously described58 (link). Briefly, denatured proteins were resolved in 12% SDS-PAGE gels, transferred to nitrocellulose membranes, and immunoblotted with antibodies against each primary antibody as bellows; anti-flag antibody (1:1000 dilution, rabbit F7425 Sigma-Aldrich), anti-HA antibody (1:1000 dilution 16B12 mouse, 901514 Biolegend), anti-myc antibody (1:1000 dilution; 9E10 mouse, sc-40; Santa Cruz Biotechnology), anti-ß-arrestin1/2 antibody (1:1000 dilution; D24H9 rabbit; Cell signaling), Immunoreactivity was revealed using secondary antibodies coupled to 680 or 800 nm fluorophores (LI-COR Biosciences, Lincoln, NE, USA), and readings were performed with the Odyssey LI-COR infrared fluorescent scanner (LICOR Biosciences).
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