Medical Conditions Terminology in Category X

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Xenoantibodies

Antibodies elicited in a different species from which the antigen originated. These antibodies are directed against a wide variety of interspecies-specific antigens, the best known of which are Forssman, Hanganutziu-Deicher (H-D), and Paul-Bunnell (P-B). Incidence of antibodies to these antigens–i.e., the phenomenon of heterophile antibody response–is useful in the serodiagnosis, pathogenesis, and prognosis of infection and latent infectious states as well as in cancer classification.

X-Bearing Sperm

The female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in man and other male-heterogametic species.

Xavin

A vasodilator used in peripheral vascular disorders and insufficiency. It may cause gastric discomfort and hypotension.

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Xantinol Nicotinate

A vasodilator used in peripheral vascular disorders and insufficiency. It may cause gastric discomfort and hypotension.

Xanthotoxin

A naturally occurring furocoumarin compound found in several species of plants, including Psoralea corylifolia. It is a photoactive substance that forms DNA ADDUCTS in the presence of ultraviolet A irradiation.

Xanthopterin

2-Amino-1,5-dihydro-4,6-pteridinedione. Pigment first discovered in butterfly wings and widely distributed in plants and animals.

Xanthophylls

Oxygenated forms of carotenoids. They are usually derived from alpha and beta carotene.

Xanthomonas maltophilia

A species of STENOTROPHOMONAS, formerly called Xanthomonas maltophilia, which reduces nitrate. It is a cause of hospital-acquired ocular and lung infections, especially in those patients with cystic fibrosis and those who are immunosuppressed.

Xanthomonas campestris

A species of gram-negative, aerobic bacteria that is pathogenic for plants.

Xanthomonas

A genus of PSEUDOMONADACEAE whose cells produce a yellow pigment (Gr. xanthos – yellow). It is pathogenic to plants.