Gene expression variation of some genes involved in cell cycle arrest in both skeletal muscle and heart of 11 days-old <i>Tk2</i> knockout (<i>Tk2</i>^−/−) mice.

<p><b>A</b>) Expression values obtained in the microarray analysis for some genes involved in cell cycle arrest at G1 or G2. SM and HE refer to each of the gene expression analyses made, in skeletal muscle and in heart. <i>n.s.</i> indicates that the gene is not significantly up- or down-regulated in the analysis. <b>B</b>) Expression of <i>Cdkn1a</i> (p21) was also analysed by Real-time qPCR for both tissues. The <i>P</i>-values for statistical comparisons (two-tailed unpaired Student's t-test) between <i>Tk2</i>^+/+ and <i>Tk2</i>^−/− tissues are shown - *<i>P</i><0.05; **<i>P</i><0.01.