If the CGHT mutations somehow alter this region of chromosome 17 so that the SOX9 protein is overproduced in hair follicle stem cells, this would cause excessive hair growth, says Zhang.

• 张学称，如果CGHT患者的基因突变使17号染色体区域发生改变，进而致使毛囊干细胞中的SOX9蛋白产生过剩，这样就会引起过多的毛发生长。