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Carotid blood flow (CBF, A) and carotid vascular resistance (CVR, B) in low altitude (LA, open circles/bars) and high altitude (HA, filled circles/bars) fetal lambs. Histograms represent 15 min average of the experimental periods (basal, early hypoxia, late hypoxia and recovery). Values are means ± SEM. Significant differences (P ≤ 0.05): a vs. LA and b vs. basal.
