Cells were detached from the culture dish with trypsin‐EDTA for 5 min and washed once with 1% BSA/PBS and incubated with either Alexa conjugated or unconjugated primary antibodies for 1 h at 4 °C. After labelling with secondary antibody, cells were analysed immediately by BD LSRII™ or BD FACSCalibur™ flow cytometers (BD Biosciences). Secondary antibody alone was used as the negative control for determining specificity of the signal.
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