Monomeric active forms of all members of the TGF-β family (3 conserved intramolecular disulfide Linkages) contain a conserved cysteine residue that forms a disulfide bond links TGF-β monomers into functional homodimers
and heterodimers
#Unit 4. Cell Communication and Cell Signaling#TGF-β Signaling#Part B Pointers