TEK and bronchopulmonary dysplasia: Ang1 and Ang2 bind to their common receptor Tie2, antagonize each other and control blood vessel maturation and stabilization during angiogenesis [25], [26]; Ang1 stabilizes blood vessel formation [21], [27], whereas Ang2 destabilizes the blood vessel structure in lung injury such as BPD [11], [28], [29].