Fig1D.Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S1567-133X(03)00056-5] Gene Expr Patterns 3: 497-501, Acampora D; Annino A; Puelles E; Alfano I; Tuorto F; Simeone A, OTX1 compensates for OTX2 requirement in regionalisation of anterior neuroectoderm. Copyright 2003