<unk>  (also known as "Hypodontia with<unk>  dysgenesis," and "Witkop syndrome") is a rare disorder, first described in 1965, characterized by<unk> s that are thin, small, and friable, and which may show koilonychia at birth. It is associated with MSX1.
Tooth and nail syndrome
Oto-palato-digital syndrome
Spastic ataxia-corneal dystrophy syndrome
Acorea, microphthalmia and cataract syndrome
Phaedra complex
Erythrokeratodermia with ataxia
Cardiofaciocutaneous syndrome
Mahvash disease