| HP:0001270 | Motor retardation | |
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| HP:0001319 | Neonatal hypotonia | "Muscular hypotonia (abnormally low muscle tone) manifesting in the neonatal period." [HPO:curators] |
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| HP:0001371 | Contractures | |
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| HP:0001419 | X-linked recessive inheritance | "A mode of inheritance that is observed for recessive traits related to a gene encoded on the X chromosome. In the context of medical genetics, X-linked recessive disorders manifest in males (who have one copy of the X chromosome and are thus hemizygotes), but generally not in female heterozygotes who have one mutant and one normal allele." [HPO:curators] |
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| HP:0002093 | Respiratory insufficiency | |
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| HP:0002486 | Myotonia | "Myotonia is characterized by an abnormally slow relaxation of the muscles after voluntary contraction or electrical stimulation. During physical examination, myotonia may be elicited by asking the patient to make a tight fist and then quickly open the hand." [HPO:curators] |
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| HP:0002650 | Scoliosis | "The presence of an abnormal lateral curvature of the spine." [HPO:curators] |
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| HP:0003198 | Myopathy | |
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| HP:0003202 | Amyotrophy | "The presence of muscular atrophy (which is also known as amyotrophy)." [HPO:curators] |
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| HP:0003236 | Elevated serum creatine phosphokinase | |
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| HP:0003391 | Gower sign | "A phenomen whereby patients are not able to stand up without the use of the hands owing to weakness of the proximal muscles of the lower limbs." [HPO:probinson] |
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| HP:0003551 | Difficulty climbing stairs | |
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| HP:0003677 | Slow progression | |
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| HP:0003829 | Incomplete penetrance | |
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| HP:0007941 | Limited extraocular movements | |
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| HP:0008994 | Proximal muscle weakness in lower limbs | "A lack of strength of the proximal muscles of the legs." [HPO:curators] |
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| HP:0009046 | Difficulty walking, running, climbing stairs | |
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