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Fig. 6 Expression of brain regionalization genes in her6 mutants. Expression patterns of brain regionalization genes (A. six3b in the forebrain and egr2b in the r3 and r5; B. hoxb1a in the r4 and posterior neural plate; C. mafba in the r5 and r6) were assessed at the bud stage in wild-type (+/+), heterozygotes (+/−), and homozygotes (−/−) in terms of her6 mutation. At the bud stage, egr2b had just started to be expressed faintly in r3 alone. Dorsal views with anterior to the top. Numbers of the embryos with the indicated patterns and total scored embryos are shown in the bottom-right. See the legend to Fig. 1 for abbreviations. Scale bar, 200 μm.