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Laughter
- ... a happy demeanor with frequent smiling and spontaneous laughter. Christianson syndrome is a rare condition, although the ...
- ... by intellectual disability, problems with movement, and inappropriate laughter and excitability) have mutations in the MECP2 gene. ...
- ... have a happy, excitable demeanor with frequent smiling, laughter, and hand-flapping movements. Hyperactivity and a short ...
- ... have a happy, excitable demeanor with frequent smiling, laughter, and hand-flapping movements. However, they can also ...