. "Edited: Jassal, B, 2006-01-18 10:19:52"^^ . "Reviewed: Heldin, CH, 2006-04-18 14:26:12"^^ . "Reviewed: Huang, Tao, 2012-05-14"^^ . "Authored: Heldin, CH, Moustakas, A, Huminiecki, L, Jassal, B, 2006-02-02"^^ . "The activated TGF-beta receptor complex is internalized by clathrin-mediated endocytosis into early endosomes. SARA resides in the membrane of early endosomes. Crystallographic studies suggest that dimeric SARA in the early endosome coordinates two R-SMAD molecules (SMAD2 and/or SMAD3) per one receptor complex."^^ . . . . . . "An anchoring protein, SARA, recruits SMAD2/3"^^ . . . . .