NOS3 and newborn respiratory distress syndrome: This study aims to investigate the association between the IL-10:c.-149+1984T>G, IL-10:c.-149+2474T>C, NOS3:c.-149+1691C>T, and NOS3:c.894T>G gene variants and susceptibility to RDS, in order to determine whether these variants play a measurable role in the development of RDS in this population and contribute new insights to the global effort of understanding genetic influences on neonatal lung disease.