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Fig. 7. Small decrease in cell proliferation in the absence of
β-catenin without altering cell survival. (A-C) Cell
proliferation at E11.5 assayed by BrdU incorporation (brown-stained cells).
(A,B) There is a small decrease in cell proliferation in the En1Cre;
R26R; β-catlof mutants but no significant
difference in β-catgof mutants (see
Table 1). (D-F)
Apoptosis at E11.5 as assayed by TUNEL (brown-stained cells); sections are
counterstained with methyl green. There is no detectable difference in cell
death in the flank and ventral mesenchyme between the mutants and control
embryos. (E) TUNEL+ cells are detectable in the apical ectodermal
ridge of the limb (inset). (A-F) En1 lineage-marked domains are
outlined in red. Composites for each panel were created from two or three
images taken at the same magnification.