Growth factors that may have a role in normal lung growth
| Fibroblast growth factor | Branching |
| Keratinocyte growth factor (FGF-7) | Branching |
| Insulin-like growth factor | Early branching |
| Platelet derived growth factor (B) | Lung growth |
| Platelet derived growth factor (A) | Early lung branching |
| Epidermal growth factor/Transforming growth factor α | Branching and growth |
| Transforming growth factor β | Branching morphogenesis |
| Vascular endothelial growth factor | Angiogenesis and vasulogenesis |
| Granculocyte macrophage-colony stimulating factor | ?Surfactant recirculation |