Smad6 inhibits signalling by the TGF-beta superfamily

Imamura T, Takase M, Nishihara A, Oeda E, Hanai J, Kawabata M, Miyazono K.
Nature. 1997 Oct 9;389(6651):622-6. 
PMID: 9335505 DOI: 10.1038/39355