科学家怀疑原因在于睾丸素。这种激素通常容易让男性脸庞更为粗犷——眉毛粗重、下颚突出、脸型更宽。
Scientists suspect that testosterone is the cause. The hormone tends to make men's faces more traditionally rugged - with heavy brows, jutting jaws and wider faces.
其主要临床特征为智力低下、特殊的外貌特征（包括长脸、大耳廓、下颌突出、巨头、腭弓高、大睾丸等）、行为及认知障碍、多动、注意力难集中以及孤独、自闭等症状。
FXS is characterized by X-linked mental retardation with additional features such as a long face with large protruding ears, macroorchidism, and eye-gaze avoidance etc.
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