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Percentage tone and calcium relationships were determined in endothelium-denuded (−ENDO) cerebral arteries from preterm fetal (95 days gestation), near-term fetal (140 days gestation), and adult (non-pregnant) sheep at 20 mmHg (A) and 60 mmHg (B). *P < 0.05 compared to other groups, determined by repeated-measures ANOVA.
