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| X chromosome |
one of the two sex chromosomes; determines female sex characteristics |
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| Xanthelasma |
fatty deposits around the eyes that are common in elderly people and are associated with high levels of cholesterol in the blood |
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| Xanthine |
a bronchodilator drug that is used to treat asthma |
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| Xanthomatosis |
a condition in which fatty deposits occur in various parts of the body, possibly leading to atherosclerosis |
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| Xeroderma pigmentosum |
a genetic disorder in which the skin is extremely sensitive to sunlight, causing it to age prematurely and leaving the individual particularly susceptible to skin cancer |
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| Xerophthalmia |
excessive dryness of the cornea and conjunctiva due to a lack of vitamin A |
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| X-linked disorder |
a genetic disorder in which the abnormal gene is located on the X chromosome; those affected are almost always men |
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| X-ray |
see Radiography |
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| XYY syndrome |
a disorder in which a man has an extra Y chromosome, causing him to be unusually tall and to have behavioural disorders |
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