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Protein expression profiles of p63 isoforms. Western blot analysis of whole cell extracts demonstrates p63 expression using (a) a pan-p63 antibody (b) and an alpha specific antibody (H-129). TAp63 and ∆Np63 isoform specific expression is shown in panels (c) and (d) respectively. Blue and red arrows mark the TAp63 and ∆Np63 protein bands, respectively. Beta-tubulin serves as a loading control. se: short exposure and le:long exposure