Fulton et al. [9] reported that the tracheal aspirate mesenchymal stromal cells (MSCs) from male infants developing BPD exhibited significantly lower messenger RNA (mRNA) expression of proliferative and anti-apoptotic factors, such as platelet derived growth factor receptor A (PDGFRA), fibroblast growth factor 7 (FGF7), wingless-type family member 2 (WNT2), sprouty 1 (SPRY1), matrix metalloproteinase 3 (MMP3), and forkhead box F2 (FOXF2). The gene discussed is MMP3; the disease is bronchopulmonary dysplasia.