Fig3A. Copyright: Reprinted with permission from Elsevier from [doi:10.1006/dbio.2000.9791] Dev Biol 224: 238-49, Bel-Vialar S; Core N; Terranova R; Goudot V; Boned A; Djabali M, Altered retinoic acid sensitivity and temporal expression of Hox genes in polycomb-M33-deficient mice. Copyright 2000