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Basement membrane (BM)-related factors. Comparison of the relative expression levels of Col4a1 (A), Hsp47 (B), Mmp14 (C), and Col6a1 (D) between the Aged Ex (−) (n = 5) and Aged Ex (+) (n = 4) using quantitative polymerase chain reaction (PCR). **p < 0.01 vs. Aged Ex (−); *p < 0.05 vs. Aged Ex (−). Data are shown as the mean ± standard error of the mean (SEM).
