SFTPA2 and newborn respiratory distress syndrome: More variants associated with the risk of RDS were also found in the surfactant protein A1 (SFTPA1) gene, the surfactant protein A2 (SFTPA2) gene, the surfactant protein D (SFTPD) gene, the nitric oxide synthase 3 (NOS3) gene, and the lysophosphatidylcholine acyltransferase 1 (LPCAT1) gene [116,117,118,119,120].