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To investigate whether in the first half of pregnancy levels of leptin in amniotic fluid are sexually dimorphic, and are related to fetal growth.Samples of amniotic fluid were collected during amniocentesis from 211 pregnancies with a single fetus with a normal karyotype (107 from male fetuses). Fetal growth was evaluated at 16 and 32 weeks of gestation, by sonography, and in a subset of 137 women...
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