(A–C) Representative dorsal view of neurula treated by whole mount in situ hybridization with probes for tfap2α (AP2α), snai2 (Slug) and pcdh8l (PCNS). Eight-cell stage embryos were injected in one dorsal animal blastomere with the arid3a morpholino (5 ng, Asterisk). The percentage of embryos with reduced signal in the injected side is given in N is the total number of embryos obtained from each case. (D) Western blot using mAb2F4 to detect pcdh8l (PCNS). Glycoproteins from 25 embryos were extracted and purify on ConA-agarose beads. Rpn1 was used as a loading control. (E) Histogram representing the percentage of embryos lacking CNC migration. One-cell stage embryos were injected with MO13. Control or KD embryos were further injected at the 8 cell stage in one animal dorsal blastomere with mRNA for RFP, PCNS, AP2α or Arid3a. Observation of the RFP fluorescence at stage 24–26 reveals that the inhibition of migration by adam13 KD is partially rescued by pcdh8l and AP2α but not Arid3a. Error bars represent standard error to the mean (Mean ± S.E.M). One-way ANOVA was performed to determine statistical significance. Statistically significant at *p<0.05, **p<0.01. (F) Representative examples of injected embryos. Posterior to the left, dorsal is up.