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Nitrite levels in whole blood samples taken from pregnant sheep and their fetuses at 125–135 days gestation. Maternal and fetal concentrations are comparable in low altitude sheep (normoxia). At high altitude (chronic hypoxia; maternal arterial Po2, 50–60 Torr), both fetal and maternal nitrite concentrations are significantly increased relative to their low altitude counterparts, and fetal nitrite concentrations are greater than those of their mothers.
