PIAS1 activates the expression of smooth muscle cell differentiation marker genes by interacting with serum response factor and class I basic helix-loop-helix proteins.

Kawai-Kowase K, Kumar MS, Hoofnagle MH, Yoshida T, Owens GK
Mol Cell Biol. 2005 Sep;25(18):8009-23. PubMed Article

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