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Though the Wnt/β-catenin signaling pathway is known to play key roles during Xenopus axis specification, whether it signals exclusively through Lef/Tcf transcription factors in this process remains unclear. To investigate this issue, we generated transgenic frog embryos expressing green fluorescent protein (GFP) driven by a Lef/Tcf-dependent and Wnt/β-catenin-responsive promoter. This promoter is...
In order to address the biological function of GlcNAc N-deacetylase/N-sulfotransferase-1 (NDST-1), we disrupted the NDST-1 gene by homologous recombination in mouse embryonic stem cells. The NDST-1 null mice developed respiratory distress and atelectasis that subsequently caused neonatal death. Morphological examination revealed type II pneumocyte immaturity, which was characterized by an increased...
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