<unk>  <unk> S) is a rare genetic syndrome caused by one or more recessive genes located on the X chromosome and causing physical anomalies and developmental delays.<unk>  was named after the first letters of the surnames of the first patients noted with the disease. First reported by American geneticists John M. Opitz and Elisabeth G. Kaveggia in 1974, its major clinical features include intellectual disability, hyperactivity, hypotonia (low muscle tone), and a characteristic facial appearance including macrocephaly (an abnormally large head).
FG syndrome
Gitelman syndrome
Mungan syndrome
Muir–Torre syndrome
Sly syndrome
Perlman syndrome
MORM syndrome
Angelman syndrome