Fetal lung maturation.
D000653:Amniotic Fluid / Q000032:analysis / Q000201:enzymology*; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008168:Lung / Q000378:metabolism; D010712:Phosphatidic Acids; D010743:Phospholipids / Q000032:analysis; D010744:Phosphoric Monoester Hydrolases; D013997:Time Factors
D010712:Phosphatidic Acids; D010743:Phospholipids; D010744:Phosphoric Monoester Hydrolases