Fig. 5. Atlas of dp-ERK during mouse embryogenesis. Schematic overview of prominent ERK signaling domains during mouse development. Regions of FGFR signaling are colored red, non-FGFR signaling regions are blue and unclassified dp-ERK domains are purple. Note that regions of weak or transient ERK activation were not maintained in culture and thus no conclusion can be made about the effect of the FGFR inhibitor and hence the role of FGFR signaling in these domains. Diagrams of mouse embryos are adapted from http://genex.hgu.mrc.ac.uk