In response to TGF-beta signaling, forkhead box transcription factors FOXO1, FOXO3 and FOXO4 bind to phosphorylated SMAD2/3:SMAD4 trimers by direct interaction between FOXO proteins and SMAD3 or SMAD4. FOXO proteins do not interact with all splicing isoforms of SMAD2 (Seoane et al. 2004).
Massague, J, Shen, L, Le, HV, Anderson, SA, Seoane, J
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