本病有家族遗传倾向，遗传学研究呈非单一性遗传特点，其致病基因及突变位点表现多样。

The disease has a familial hereditary tendency, genetic research shows a non-singleness genetic character, and the manifestations of its pathogenic gene and mutation site are various.

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没有特别的取向或方向特征，也没有改变位置的倾向。

Having no particular orientation or directional characteristics. Also having no tendency to change position.

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