IndraLab
Statements
reach
"Ligand binding and recruitment of TβRI activates its kinase that phosphorylates the carboxy-terminal serine residue of SMAD2 (SMAD Family Member 2) or SMAD3 (SMAD Family Member 3), which induces oligomerization of SMAD2 or SMAD3 with SMAD4 (SMAD Family Member 4), resulting in nuclear translocation for transcriptional activation or repression of target genes."