Files in this Data Supplement:

• Supplemental file 1 - Supplemental Fig. S1 (p21 colocalizes with phospho-serine 10 H3 histone at G₂/M phase), S2 (Control experiments showing the effects of Tat fusions), S3 (p21 protein hyperphosphorylation in HCT116 and DLD1 cells), S4 (p21 is present in S and G₂/M cells and delayed accumulation of phosphorylated serine 10 histone H3-positive p21^-/- cells following Nocodazole exposure, and S5 (p21 colocalizes with cyclin A in the nucleus at G₂/M) and legends.
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