Optic stalks and optic recesses are enlarged in aus mutant embryos. Sections through the head region of prim-12 stage wildtype and aus mutant embryos. (A,C) Parasagittal section at the junction between retina and optic stalks. The optic stalks (arrowheads) are larger in the aus mutant embryo (C) as compared to a wild-type sibling (A). (B,D) Sagittal section. The optic recess is expanded in an aus mutant embryo (D) as compared to a wild-type sibling (B). Abbreviations: cb, cerebellum; hy, hypothalamus; op, olfactory placodes; or, optic recess; r, retina; t, telencephalon; te, tectum; wt, wild type. Scale bar: 25 μm.
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