For preparing whole-cell lysate, SN12C and SN12L1 cells were washed twice with cold phosphate-buffered saline (PBS), harvested, and lysed with 0.1% sodium dodecyl sulfate (SDS)-added radioimmunoprecipitation assay buffer (Thermo Fisher Scientific, Tokyo, Japan) [49 (link)]. Cell fractions were extracted using a Cell Fractionation Kit (Abcam), according to the manufacturer’s instructions [50 (link)]. Protein assay was performed using a Protein Assay Rapid Kit (Wako Pure Chemical Corporation, Osaka, Japan).
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