The following antibodies were purchased: β-actin (sc-47778, Santa Cruz Biotechnology, Santa Cruz, CA, USA), insulin (L6B10, Cell Signaling Technology, Danvers, MA, USA, and sc-9168, Santa Cruz Biotechnology), UGGT1 (14,170–1-AP, Proteintech, Rosemont, IL, USA; sc-374565, Santa Cruz Biotechnology; and ab13520-50, Abcam), and FLAG (F-1804, Sigma, St. Louis, MO, USA). UGP knockdown siRNA (sc-154894) was purchased from Santa Cruz31 (link).
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