A protein complex that consists of only SMAD proteins; may be homomeric or heteromeric. Heteromeric complexes act as transcription factors while homomeric complexes exist but are transcriptionally inactive. Hetero- versus homotrimerization is largely enthalpy driven. [ GOC:bhm GOC:mah http://www.ncbi.nlm.nih.gov/pubmed/9670020 ]

Synonyms: SMAD complex

This is just here as a test because I lose it

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