SQ20B and FaDu cells were cultured in 6 well plates. After 24h treatment, cells were harvested and resuspended into a density of 106cells/ml. BD Pharmingen FITC Annexin V Apoptosis Detection Kit I (BD Science, San Diego, CA) was used to perform the staining, according to the protocol recommended by the manufacturer as described previously [30 (link)]. The stained cells were then analyzed by Cellometer Vision CBA Analysis System (Nexcelom Bioscience, Lawrence, MA).
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