Western blot was performed as described elsewhere [44 (link)]. The primary antibodies that were used were anti-P-glycoprotein (ab3366, RRID: AB_303744), anti-actin (ab11003, RRID: AB_297660) from Abcam (Cambridge, UK), and anti-TRIP6 (HPA052813, RRID: AB_2681961) from Atlas Antibodies (Bromma, Sweden). SuperSignal™ West Pico PLUS Chemiluminescent Substrate or West Femto Maximum Sensitivity Substrate (Pierce, Rockford, IL, USA) were applied on a membrane to detect the chemiluminescence signal of secondary HRP-conjugated goat anti-mouse (SA00001-1, RRID: AB_272565) and HRP-conjugated goat anti-rabbit (SA00001-2, RRID: AB_272564) from Proteintech (Rosemont, IL, USA). Images were obtained using ChemiDoc MP imaging system (Biorad, Hercules, CA, USA).
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