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Vasoconstrictor response of middle cerebral arteries to potassium chloride (KCl, A), noradrenaline (NA, B), and phenylephrine (Phe, C) in low altitude (LA, open circles/bars) and high altitude (HA, filled circles/bars) fetal lambs. Values are means ± SEM. Significant differences (P ≤ 0.05): a vs. LA.
