Hemophilia is an X-chromosome chain of congenital haemorrhagic disease, women usually only with genes, no symptoms but may pass on the gene to the next generation.<br><br>Hemophilia can be divided into two main types, the lack of the eighth factor is called type A haemophilia, the lack of the ninth factor is called type B haemophilia.<br><br>Most of the patients are men. Women with a single infunctional X chromosome may have some mild symptoms.<br><br>Responsible for the permanent repair of haemophilia genes is a worthy goal of medical science.
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