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X-linked Agammaglobulinaemia see Primary Immunodeficiencies
X-linked Hypophosphataemia
X-linked Ichthyosis see Ichthyosis
Xanthinuria Deficiency see Purine & Pyrimidine Metabolic diseases
Xeroderma Pigmentosum
XLA see Primary Immunodeficiencies
XO syndrome see Turner syndrome
XP see Xeroderma Pigmentosum
XXX see Triple-X syndrome
XXXXY see Klinefelter syndrome
XXXY see Klinefelter syndrome
XXY see Klinefelter syndrome
XYY syndrome