Figure 2.
Twsg1−/− embryos display widely variable craniofacial phenotypes at E13.5. Normal craniofacial phenotypes are seen in Twsg1+/− (A). Twsg1−/− embryo display craniofacial phenotypes that range from normal mandibular arch development (with or without associated defects such as microphthalmia (B) to simple agnathia with a hypoplastic mandibular arch (arrow), low set ears and microstomia (C) to severe holoprosencephaly/agnathia with no mandibular arch (arrowhead) or grossly evident stomodeum (D). e—eye. Bar, 200 mm.