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Fig. 7. Promotion of neural crest progenitor fate is a conserved activity of Id family proteins. (A,B) Expression of an N-terminally tagged form of Xenopus Id2 phenocopies the effects of Id3, leading to the persistent expression of Sox10 (red arrows) on the injected (A) versus control (B) side of the embryo. (C-F) Expression of N-terminally epitope tagged forms of human Id2 (C versus D) and human Id3 (E versus F) had identical effects.