1.严重联合免疫缺陷（severecombinedimmunodeficiency，SCID）（1）T细胞缺陷B细胞正常SCID（T-</sup>B+</sup>SCID）：①X连锁T-B+SCID病因为定位于Xq13.1上的白细胞介素-2受体γ链（IL-2Rγ）基因突变导致SCID，且是SCID中较常见的病种。
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