有两种罕见的家族遗传病它们的致病基因分别位于常染色体和x染色体上一种先天代谢病称为�尿病aa病人的尿在空气中放一段时间后就会变� Template




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tomski有两种罕见的家族遗传病它们的致病基因分别位于常染色体和x染色体上一种先天代谢病称为�尿病aa病人的尿在空气中放一段时间后就会变� coloring