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Chromosome 7 (human) : ウィキペディア英語版 | Chromosome 7 (human)
Chromosome 7 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 7 spans about 159 million〔(What is chromosome 7 ), "Genetics Home Reference" of U.S. National Library of Medicine. April 2008. ().〕 base pairs (the building material of DNA) and represents between 5 and 5.5 percent of the total DNA in cells. Identifying genes on each chromosome is an active area of genetic research. Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. Chromosome 7 is likely to contain between 1,000 and 1,400 genes. It also contains the Homeobox A gene cluster.〔〕 ==Diseases and disorders== The following diseases are some of those related to genes on chromosome 7: * argininosuccinic aciduria * cerebral cavernous malformation〔〔 * Charcot–Marie–Tooth disease, type 2D〔 * Charcot–Marie–Tooth disease, type 2F〔〔 * Cholestasis, progressive familial intrahepatic 3〔 * Citrullinemia, type II, adult-onset,〔 * congenital bilateral absence of vas deferens〔 * cystic fibrosis〔〔〔 * Developmental verbal dyspraxia * distal spinal muscular atrophy, type V * Ehlers–Danlos syndrome, arthrochalasia type VII〔 * Ehlers–Danlos syndrome, classical type〔 * hemochromatosis, type 3〔 * Hereditary nonpolyposis colorectal cancer HNPCC4〔 * Lissencephaly syndrome, norman-roberts type〔 * Marfan syndrome〔 * maple syrup urine disease * maturity onset diabetes of the young type 3 * mucopolysaccharidosis type VII or Sly syndrome〔 * Muscular dystrophy, limb-girdle, type 1D〔 * myelodysplastic syndrome * Myotonia congenita〔 * nonsyndromic deafness〔 * nonsyndromic deafness, autosomal dominant〔 * nonsyndromic deafness, autosomal recessive〔 * osteogenesis imperfecta * osteogenesis imperfecta, type I * osteogenesis imperfecta, type III * osteogenesis imperfecta, type II * osteogenesis imperfecta, type IV * p47-phox-deficient chronic granulomatous disease * Pendred syndrome〔 * Romano–Ward syndrome * Shwachman–Diamond syndrome〔〔 * Schizophrenia * Silver-Russell syndrome * Specific language impairment〔〔 * Tritanopia or tritanomaly color blindness〔 * Williams syndrome〔〔
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