201Wolfram Syndrome (Wolfram症候群)
202Worster-Drought Syndrome (WDS)
203WWOX Syndrome (Genetic Disorder)
204Xeroderma Pigmentosum (XP) (著色性乾皮症)
205X-linked Agammaglobulinemia (XLA) (X-連鎖無丙種球蛋白血症)
206X-linked Hypophosphatemic Rickets (XLH) (性聯遺傳型低磷酸佝僂症)
207X-linked Myotubular Myopathy (XLMTM) (肌小管病變)
208X-linked Retinoschisis (XLRS) (Genetic Disorder)
209X-linked Thrombocytopenia (XLT) (Genetic Disorder)