title: The preterm fetus with mature lungs.
mesh_terms: D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008168:Lung / Q000196:embryology* / Q000254:growth & development; D010713:Phosphatidylcholines / Q000378:metabolism; D012127:Respiratory Distress Syndrome, Newborn / Q000175:diagnosis; D013109:Sphingomyelins / Q000378:metabolism
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins