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Unidirectional flux of nutrients across the placenta (A and C) and fetal accumulation of tracer per gram of fetus (B and D). A and B, [14C]-MeAIB (n = 6 litters per group). C and D, [14C]-methyl-d-glucose (n = 6 litters per group). Values are means ± sd. **, P < 0.001 (unpaired Student's t test).
