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 Medical Concepts
  Chemicals and Drugs
 Amino Acids, Peptides, and Proteins
 Peptides
 Intracellular Signaling Peptides and Proteins
 Adaptor Proteins, Signal Transducing
 Smad Proteins
 Smad Proteins, Inhibitory
 Smad Proteins, Receptor-Regulated
 Smad1 Protein
 Smad2 Protein
 Smad3 Protein
 Smad5 Protein
 Smad8 Protein
 Smad4 Protein

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