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. 2011 Sep 8;6(9):e24152. doi: 10.1371/journal.pone.0024152

Figure 3. TGF-β protein structures and motifs.

Figure 3

(A) Predicted amino acid sequences of the TGF-β peptide domain and flanking region. Adjacent to the peptide domain is the cleavage site, showing the conserved RXXR motif. Asterisks below the sequence mark the seven conserved cysteine residues. The arrow indicates the conserved cysteine found in TGF-β-like class of ligands. (B) Conserved protein domains of Mnemiopsis TGF-β ligands. The red boxes indicate signal sequences, while the other shaded boxes represent TGF-β propeptide and TGF-β peptide domains, as predicted by SMART.