Children who succumb to Alexander disease, a fatal childhood disorder causing mental retardation and abnormal myelin, have a mutation of an astrocyte gene.

• 亚历山大症（Alexanderdisease）这种致命的儿童疾病，会造成心智障碍与异常的髓鞘，就是因为神经胶细胞的某一个基因产生了突变。