Figure S1, 10.5 +/-. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2005.02.001] Dev Biol 280: 386-95, Bedford L; Walker R; Kondo T; van Cruchten I; King ER; Sablitzky F, "Id4 is required for the correct timing of neural differentiation." Copyright 2005 [PMID:15882580]