1. Book: Branching Morphogenesis, J. Davies, 2005, Springer.
2. Video of branching morphogenesis in culture; http://www.youtube.com/watch?v=dxsWnNxpRBU (accessed 18.11.13).
3. GUDMAP database (very large database of gene expression in renal development, including that of the branching collecting duct): www.gudmap.org (accessed 18.11.13).
4. GO Ontology entry for branching morphogenesis (a useful springboard for exploring molecules involved): https://www.ebi.ac.uk/QuickGO/GTerm?id=GO:0048754 (accessed 18.11.13).
5. The role of transforming growth factor beta in lung development and disease;Bartram;Chest,2004