Figure 1. Characterization of CF-derived iPS cells. (A) Mouse iPS cells cultured on feeder free matrigel coated dish; (B) Immunostaining of iPS cells for the classic ES cell marker Nanog (red). Nuclei were stained with DAPI (blue); (C) Image of an explanted teratoma; (D–F) Hematoxylin and eosin staining of teratoma sections 3 wk after iPS cell transplantation.