Figure 5. Effects of circulatory factors on gene expression of key SASP factors in IVDs in mouse heterochronic parabiotants. qRT-PCR quantitation of TFNα (A), L-1β (B) and IL-6 (C) mRNAs from discs from the four groups of mice. Data shown are mean ± SD of 5 independent experiments, *p < 0.05.