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A form of congenital disorders of N-linked glycosylation with characteristics of intrauterine growth retardation, microcephaly, failure to thrive, developmental delay, intellectual disability, hypotonia, seizures, optic nerve atrophy and respiratory difficulties. Genital abnormalities (micropenis, hypoplastic scrotum, undescended testes) have also been reported. Caused by mutations in the gene STT3B (3p24.1).
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