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Optimal diameter in systemic and umbilical arteries from guinea pig fetuses. Optimal diameter determined by measuring the maximal active force in response to KCl in (A) aorta, (B) common carotid, (C) umbilical, and (D) femoral arteries from control (open bars, n = 7 different subjects) and FGR (solid bars, n = 6 different subjects) fetal guinea pigs. Values were expressed as Mean ± SEM. **p < 0.01, ***p < 0.001 t-test.
