Endoglin null endothelial cells proliferate faster and are more responsive to transforming growth factor beta1 with higher affinity receptors and an activated Alk1 pathway.
Pece-Barbara N, Vera S, Kathirkamathamby K, Liebner S, Di Guglielmo GM, Dejana E, Wrana JL, Letarte M.

Proteomic identification of activin receptor-like kinase-1 as a differentially expressed protein during hyaloid vascular system regression.
Albè E, Escalona E, Rajagopal R, Javier JA, Chang JH, Azar DT.

Loss of distinct arterial and venous boundaries in mice lacking endoglin, a vascular-specific TGFbeta coreceptor.
Sorensen LK, Brooke BS, Li DY, Urness LD.

Crystal structure of BMP-9 and functional interactions with pro-region and receptors.
Brown MA, Zhao Q, Baker KA, Naik C, Chen C, Pukac L, Singh M, Tsareva T, Parice Y, Mahoney A, Roschke V, Sanyal I, Choe S.

TGFbeta1 induces vasculogenesis and inhibits angiogenic sprouting in an embryonic stem cell differentiation model: respective contribution of ALK1 and ALK5.
Mallet C, Vittet D, Feige JJ, Bailly S.