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Ex vivo contractile response to KCl in arteries from fetal to aged guinea pigs. Concentration-dependent tension to KCl in carotid (A) and femoral arteries (B) from control fetus (gray circles, dashed black lines), control adult (open circles, continuous black lines), and control aged guinea pigs (solid circles, continuous black lines). Values are expressed in mean ± SEM. *p < 0.05, **p < 0.01, ***p < 0.001 vs term fetus. Two-way ANOVA.
