Western blotting was performed as described before (Xue et al., 2017 (link)). Each lane was loaded 20–40 μg protein, and the PVDF membrane was blocked with 5% skim milk in 0.1% TBST for 1 h. After washing the membrane for three times, the membrane was incubated with primary antibody at 4°C overnight. HRP-conjugated secondary antibody and ECL kit were used to detect primary antibody with Bio-Rad Exposure System. The gray value of each lane was calculated with ImageJ.
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