Phosphorylated SMAD2 and SMAD3 form a complex with SMAD4
The SMAD2/3:SMAD4 complex transfers to the nucleus
Activin A/AB/B Binds Activin Receptor ACVR2A/B:ACVR1B
Activin AB/B Binds Activin Receptor ACVR2A/B:ACVR1C
ACVR2A/B (ActRIIA/B) Phosphorylates ACVR1B (ActRIB, ALK4) in Response to Activin
ACVR2A/B (ActRIIA/B) Phosphorylates ACVR1C (ActRIC, ALK7) in Response to Activin
Phosphorylation of SMAD2/3 by Activin:Activin Receptor
Phospho R-SMAD(SMAD2/3):CO-SMAD(SMAD4):FOXH1 Binds Activin Response Element
FSTL3 binds Activin
Follistatin (FST) binds Activin
Signaling by Activin
Antagonism of Activin by Follistatin