Reduced or absent expression of NKX2.1 is seen in areas of acute inflammation, atelectasis, as well as bronchopulmonary dysplasia, in the lungs of infants (Wert et al., 2002; Chen et al., 2012; Young et al., 2013; Lopez et al., 2015). This evidence concerns the gene NKX2-1 and bronchopulmonary dysplasia.