Fig 5A. [doi:10.1093/emboj/16.19.5930] Schoorlemmer J; Marcos-Gutierrez C; Were F; Martinez R; Garcia E; Satijn DP; Otte AP; Vidal M, EMBO J 1997 Oct 1;16(19):5930-42. "Ring1A is a transcriptional repressor that interacts with the Polycomb-M33 protein and is expressed at rhombomere boundaries in the mouse hindbrain." © Nature Publishing Group. Reproduced with permission from EMBO J.