Fig7C. from [doi:10.1093/emboj/cdg169] Trokovic R; Trokovic N; Hernesniemi S; Pirvola U; Vogt Weisenhorn DM; Rossant J; McMahon AP; Wurst W; Partanen J. 2003. EMBO J 22(8): 1811-23. FGFR1 is independently required in both developing mid- and hindbrain for sustained response to isthmic signals. [PMID:12682014] © Nature Publishing Group. Reproduced with permission from EMBO J.