Figure 2L. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2005.12.003] Dev Biol 291: 38-52, Mackay DR; Hu M; Li B; Rheaume C; Dai X, "The mouse Ovol2 gene is required for cranial neural tube development." Copyright 2006 [PMID:16423343]