| HP:0000175 | Cleft palate | "Cleft palate is a developmental defect of the `palate` (FMA:54549) resulting from a failure of fusion of the palatine processes." [HPO:curators] |
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| HP:0000204 | Cleft lip | "A gap in the `upper lip` (FMA:59817). This is a congenital defect resulting from nonfusion of tissues of the lip during embryonal development." [HPO:probinson] |
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| HP:0000252 | Microcephaly | "Microcephaly is a neurodevelopmental disorder in which the circumference of the head is more than two standard deviations smaller than the age- and gender-dependent norm." [HPO:curators] |
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| HP:0000365 | Hearing loss | |
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| HP:0000718 | Aggressive behavior | "Aggressive behavior can denote verbal aggression, physical aggression against objects, physical aggression against people, and may also include aggression towards oneself." [HPO:curators] |
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| HP:0000752 | Hyperactivity | |
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| HP:0000826 | Precocious puberty | "The onset of secondary sexual characteristics before a normal age. Although it is difficult to define normal age ranges because of the marked variation with which puberty begins in normal children, precocious puberty can be defined as the onset of puberty before the age of 8 years in girls or 9 years in boys." [HPO:curators] |
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| HP:0001249 | Mental retardation | |
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| HP:0001250 | Seizures | "Seizures are an intermittent `abnormality of the central nervous system` (FMA:HP:0002011) due to a sudden, excessive, disorderly discharge of cerebral neurons and characterized clinically by some combination of disturbance of sensation, loss of consciousness, impairment of psychic function, or convulsive movements." [HPO:probinson] |
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| HP:0001257 | Spasticity | "A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes." [HPO:curators] |
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| HP:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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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:0001423 | X-linked dominant inheritance | "A mode of inheritance that is observed for dominant traits related to a gene encoded on the X chromosome. In the context of medical genetics, X-linked dominant disorders tend to manifest very severely in affected males. The severity of manifestation in females may depend on the degree of skewed X inactivation." [HPO:curators] |
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| HP:0001999 | Facial dysmorphism | |
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| HP:0002079 | Hypoplasia of the corpus callosum | "Underdevelopment of the corpus callosum." [HPO:curators] |
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| HP:0002119 | Ventriculomegaly | |
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| HP:0002136 | Broad-based gait | "An abnormal gait pattern in which persons stand and walk with their feet spaced widely apart. This is often a component of cerebellar ataxia." [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:0003593 | Early onset | |
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| HP:0004325 | Decreased body weight | |
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| HP:0100660 | Dyskinesis | "A movement disorder which consists of effects including diminished voluntary movements and the presence of involuntary movements." [HPO:sdoelken] |
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