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SB-4 is an activator of bone morphogenetic protein 4 (BMP4) signaling.1 It induces BMP4 signaling in a reporter assay using HEK293 cells expressing a recombinant human BMP4 response element (EC50 = 74 nM). SB-4 (10 µM) increases phosphorylation of SMAD1, -5, and -9 in HEK293 cells. It also induces Blimp1 and Tfap2c expression, markers of germline differentiation, in mouse embryonic stem cells.2
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1. High-
2. A comparison between BMP4 and SB4 in inducing germ line gene expression pattern during embryonic stem cells differentiation. Differentiation 123, 9-17 (2022).