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Fig. 1. The Bmpr1a;Bmpr1b double-mutant mouse is
holoprosencephalic. (A) The genetic cross that generates the double
mutant. (B,C) E11.5 double-mutant and control littermates. Note
the small eye in the mutant (arrowhead). (D-K) Cresyl Violet staining
of E10.5 (D-G) and E11.5 (H-K) control and mutant telencephalons from rostral
(D,E,H,I) and more posterior coronal sections (F,G,J,K). D' and E'
are magnifications of the rostral midline (boxed) in D and E, respectively,
showing a thick neuroepithelium in the mutant. F' and G' are
magnifications of the dorsomedial regions (boxed) in F and G, respectively,
showing no invagination in the mutant. Arrowheads (H,I) point to the rostral
midline, which is thicker in the mutant (I). Arrows (J,K) indicate the missing
dorsal midline in the mutant (K). bg, basal ganglia; cx, cerebral cortex; dm,
dorsal midline; dt, dorsal telencephalon; me, facial mesoderm; rm, rostral
midline; vm, ventral midline; vt, ventral telencephalon.