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X连锁智力低下(MR)可分为二类:与X染色体标记fra(X)(q28)及巨睾丸相联系的MR;还有与X染色体的脆性部位表达无关的MR。在具有Xq标记的男性患者中可见形态变化特征如下:高前额、外突的下
X-linked mental retardation (MR) can be divided into two categories: MR linked to the X chromosome marker fra (X) (q28) and giant testes; and MR unrelated to the expression of the fragile X chromosome. The morphological changes seen in male patients with Xq markers are as follows: high forehead,