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・ X-ray spectroscopy
・ X-Ray Spex
・ X-ray standing waves
・ X-ray star
・ X-ray telescope
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・ X-linked dominant inheritance
・ X-linked endothelial corneal dystrophy
・ X-linked hypertrichosis
・ X-linked hypophosphatemia
・ X-linked ichthyosis
X-linked intellectual disability
・ X-linked lymphoproliferative disease
・ X-linked myotubular myopathy
・ X-linked recessive chondrodysplasia punctata
・ X-linked recessive hypoparathyroidism
・ X-linked recessive inheritance
・ X-linked reticulate pigmentary disorder
・ X-linked severe combined immunodeficiency
・ X-linked spinal muscular atrophy type 2
・ X-Lite
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・ X-Man (disambiguation)


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X-linked intellectual disability : ウィキペディア英語版
X-linked intellectual disability

X-linked intellectual disability (previously known as X-linked mental retardation) refers to forms of intellectual disability which are specifically associated with X-linked recessive inheritance.
As with most X-linked disorders, males are more heavily affected than females.〔(【引用サイトリンク】title=Fragile X Syndrome - X-linked Mental Retardation and Macroorchidism )〕 Females with one affected X chromosome and one normal X chromosome tend to have milder symptoms.
Unlike many other types of intellectual disability, the genetics of these conditions are relatively well understood. It has been estimated there are ~200 genes involved in this syndrome; of these ~100 have been identified.
X-linked intellectual disability accounts for ~16% of all cases of intellectual disability in males.
==Syndromes==
Several X-linked syndromes include intellectual disability as part of the presentation. These include Coffin-Lowry syndrome, MASA syndrome, X-linked alpha thalassemia mental retardation syndrome, and mental retardation and microcephaly with pontine and cerebellar hypoplasia.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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