In vitro studies of the human transport of amino acids have been performed [26]: in vesicle obtained from IUGR placentas, a reduced uptake of leucine and lysine has been reported, indicating a reduction of number or activity of the neutral and cationic amino acids transporters [45]; a decreased transport of taurine in isolated MVM has also been observed [46], suggesting a reduced activity of β amino acid transporters. This evidence concerns the gene SLC38A7 and fetal growth restriction.