Figure 2B. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S1567-133X(03)00029-2] Gene Expr Patterns 3: 355-60, de Sousa Lopes SM; Carvalho RL; van den Driesche S; Goumans MJ; ten Dijke P; Mummery CL, Distribution of phosphorylated Smad2 identifies target tissues of TGF beta ligands in mouse development. Copyright 2003.