Heritable mutations of ALAS2 gene are responsible for the human X-linked sideroblastic anemia.

ALAS2基因的可遗传突变是人类X连锁铁粒幼细胞性贫血的原因。

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This is an X-linked deficiency of one of the enzymes in the urea cycle.

这是一个X染色体缺陷导致的尿素循环酶缺乏症之一。

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Medically, the condition is called X-linked Severe Combined Immunodeficiency (X-SCID).

在医学上，这种情况称为X连锁重症联合免疫缺陷(X - SCID)。

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Originally the trials were considered a huge success when a number of patients were successfully treated for the X-linked Severe Combined Immunodeficiency Syndrome (X-Scid) which is more commonly known as the "Boy in the Bubble" syndrome.

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