Fig. 3. Pax2-dependent gene expression in the developing mid-hindbrain region. Pax2^+/+ or Pax2^+/– control embryos (A,C,E,G,I) and Pax2^–/– embryos (B,D,F,H,J) were analyzed by for expression of the indicated genes by in situ hybridization at the five to six somite (A,B,I,J) or seven to eight somite (C-H) stage. Arrowheads indicate the position of the mid-hindbrain boundary. anr, anterior neural ridge; fb, forebrain.