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Fig. 3. ascl1a mutants show decreased expression of the lim3,
pitx3 and ascl1a, and fail to initiate expression of
neurod, pit1 and all adenohypophyseal hormone genes, whereas
the hypothalamus appears unaffected. Columns 1 and 3 show wild-type
siblings (wt); columns 2 and 4 show pia mutants. Probes used for
whole-mount in situ hybridization are indicated in lower right-hand corners,
ages of embryos in the upper right-hand corners of wild types.
(A,C,E,F,G,N) Lateral views, anterior towards the right, dorsal
upwards. (B,D,H-M) Dorsal views, anterior towards the right. Arrows in
A-H indicate expression in the adenohypophysis. Inset in E shows section
through pituitary of pia mutant at 120 hpf (see
Fig. 2J for wild-type control).
h, hypothalamus.