Fra-1 is a critical regulator of mouse stromal cell decidualization. Primary mouse stromal cells transfected with Fra-1 and scrambled (NC) siRNA were collected 48 h after treatment. A, down-regulation of Fra-1 mRNA (upper) and protein (lower) was assessed by real-time PCR and immunocytochemistry, respectively. B, differential gene expression of decidualization markers such as alkaline phosphatase (ALP) and prolactin-related protein (PRP) in cells transfected with NC siRNA and Fra-1 siRNA was quantitated by real-time PCR. C, alkaline phosphatase activity in NC (left) and Fra-1 (right) siRNA-treated stromal cells. Error bars, S.E.