Shen, Chen, Wang et al.: "Smad6 interacts with Runx2 and mediates Smad ubiquitin regulatory factor 1-induced Runx2 degradation." in: The Journal of biological chemistry, Vol. 281, Issue 6, pp. 3569-76, 2006 (PubMed).
Choi, Lee, Lim et al.: "Smad6 negatively regulates interleukin 1-receptor-Toll-like receptor signaling through direct interaction with the adaptor Pellino-1." in: Nature immunology, Vol. 7, Issue 10, pp. 1057-65, 2006 (PubMed).
Shintani, Yagi, Nakayama et al.: "A new nonsense mutation of SMAD8 associated with pulmonary arterial hypertension." in: Journal of medical genetics, Vol. 46, Issue 5, pp. 331-7, 2009 (PubMed).