Fig. 5. Cells of the dnFgfr ES cell line1C6 colonize most lineages of the early embryo when introduced as chimera aggregated with wild-type cells. (A-C) ß-Galactosidase staining indicates derivatives of the 1C6 line. (A) 7.5 dpc embryo, whole mount. (B) 7.5 dpc crosssection at the level of line in A. (C) 9.5 dpc embryo sagittal section. (B,C) Plastic embedded sections. Scale bars: 50 µm.