Daf1-positive cells are negative for Nanog expression. Mouse Nanog-iPS cells, in which GFP expression is driven by Nanog promoter [45], are differentiated into DE. Cxcr4+/E-cadherinâ+âcells were sorted and analyzed for Daf1 and Nanog-GFP expression. Daf1-positive cells are negative for Nanog expression. (TIF 312Â kb