The P16 mRNA and protein levels in the cells were analysed as previously described [19]. Rabbit monoclonal antibody against human P16 protein (ab108349, Abcam, Britain) was used in the Western blot assay, and mouse monoclonal antibody against the human P16 protein (Ventana Roche-E6H4, USA) was used in the immunostaining assay. These experiments were performed in triplicate and repeated at least one time.
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