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Mean (±s.e.m.) plasma leptin concentration in fetuses (A) and ewes (B) before and during an i.v. infusion of saline (n = 6) or leptin (n = 6) to the fetus for 5 days. *Significant difference from pre-infusion baseline, P < 0.05. †Significant difference from saline-infused fetuses on the same day, P < 0.05.
