409355994ENSG00000120693ENSMUSG00000027796O15198Q9JIW5NM_001127217NM_005905NM_001378621NM_019483NP_001120689NP_005896NP_001365550NP_062356Mothers against decapentaplegic homolog 9 also known as SMAD9, SMAD8, and MADH6 is a protein that in humans is encoded by the SMAD9 gene.

[5] SMAD9, as its name describes, is a homolog of the Drosophila gene: "Mothers against decapentaplegic".

Like many other TGFβ family members, SMAD9 is involved in cell signalling.

It is subsequently transferred to the nucleus where it forms complexes with other proteins and acts as a transcription factor.

Mothers Against Drunk Driving or (MADD); and based on a tradition of such unusual naming within the gene research community.