Pulmonary Immaturity, also known as primary atelectasis of newborn, is related to respiratory failure and respiratory distress syndrome in premature infants. An important gene associated with Pulmonary Immaturity is MAPKAPK5 (MAPK Activated Protein Kinase 5), and among its related pathways/superpathways are Diseases of glycosylation and Surfactant metabolism. The drugs Carbon monoxide and Poractant alfa have been mentioned in the context of this disorder. Affiliated tissues include lung and fetal lung, and related phenotypes are homeostasis/metabolism and respiratory system