Dose-dependent Smad1, Smad5 and Smad8 signaling in the early mouse embryo.
Three closely related mammalian R-Smads, namely Smad1, Smad5 and Smad8, are activated by BMP receptors. Here we have taken a genetic approach to further dissect their possibly unique and/or shared roles during early mouse development. A Smad8.LacZ reporter allele was created to visualize Smad8 expression domains. Smad8 is initially expressed only in the visceral yolk sac (VYS) endoderm and shows a highly restricted pattern of expression in the embryo proper at later stages. In addition, Smad8...Expand abstract
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