Supplementary Data from p34&lt;sup&gt;SEI-1&lt;/sup&gt; Inhibits Doxorubicin-Induced Senescence through a Pathway Mediated by Protein Kinase C-δ and c-&lt;i&gt;Jun&lt;/i&gt;-NH&lt;sub&gt;2&lt;/sub&gt;-Kinase 1 Activation in Human Breast Cancer MCF7 Cells