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Fetal plasma cortisol concentration in response to CRH in singleton and twin fetal sheep in late gestation. Plasma cortisol concentrations increased (P < 0.0001) in response to CRH (1 μg bolus) in singleton (A) and twin (B) fetuses in all nutritional groups. CRH injected at time 0. #Significant increase in plasma cortisol concentration vs. preinfusion values.
