Soybean phosphatidylcholine (SPC), cholesterol, and DSPE-PEG2000 were purchased from Avanti lipids (Avanti Polar Lipids, Alabaster, AL, USA). Dimethyl sulfoxide (DMSO), copper chloride (CuCl2), and 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Fetal bovine serum (FBS) and DMEM-F12 medium (access date 12 March 2021,Gibco, Grand Island, NY, USA) were purchased from Thermo Fisher Scientific (Waltham, MA, USA), respectively. DQ was synthesized in our laboratory based on a previous report [12 (link)].
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