Fig. 7. Analysis of Xfz3 activity in whole embryos. Albino embryos were injected at the two cell stage with RNA into the animal pole region of either the left or right blastomere. RNAs used were Xfz3 (0.75-3.0 ng), Nfz3 (0.75-3.0 ng), Xwnt1 (10 pg) and the lineage tracer ß-galactosidase (200 pg). The red nuclear ß-galactosidase staining indicates the side injected. The dark purple indicates Xslug expression. All panels are dorsal views with anterior to the left; the view of Xfz3 is slightly oblique with the arrow indicating ectopic Xslug on the injected ventral lateral side of the embryo.