Fig. 4. Expression patterns of genes in wild-type embryos (left panels) and ß-catenin gain-of-function mutants (right panels) that are important in embryonic patterning, as determined by immunohistochemistry (A,B) and in situ hybridisation (C-N). Transverse sections of the epiblast region at E6.5 are shown. Posterior is towards the right in wild type, as indicated above A.