a nucleoside composed of xanthine and ribose.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

xan·tho·sine (X, Xao),

(zan'thō-sēn, -sin),
9-β-d-Ribosylxanthine; the deamination product of guanosine (O replacing -NH2).
Farlex Partner Medical Dictionary © Farlex 2012


(X) (zan'thō-sēn)
The deamination product of guanosine (O replacing -NH2).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
They suggested combining the biomarker pattern of leukotriene E4, 3-hydroxypalmitoylcarnitine, aspartate, xanthosine and methoxytryptophan for diagnosis of deficiencies caused infertility in normospermic/idiopathic infertile men (24).
So, for their enzymatic studies, they chose to use xanthosine, a naturally occurring purine with a structure very similar to pi.
When they made short DNA template strands that included a kappa bead, the RNA and DNA polymerases assembled complementary strands with the xanthosine bases always opposite the kappa.
ITPA, a cytosolic enzyme present in many tissues (e.g., erythrocytes, leukocytes, heart, liver, endocrine glands), catalyzes the pyrophosphohydrolysis of ITP/dITP and xanthosine triphosphate, thereby preventing accumulation of unusual nucleotides in cells and incorporation into RNA and DNA.
IMPDH (EC (1) catalyzes the NAD-dependent oxidation of inosine 5'-monophosphate (IMP) to xanthosine 5'-monophosphate (XMP).
Xanthosine was not found in the urine samples of the two patients.
Xanthosine was detected in only one of these urine samples, in a low concentration (80 [micro]mol/mmol creatinine).
(3) Nonstandard abbreviations: MPA, mycophenolic acid; IMP-DH, inosine 5'-monophosphate dehydrogenase; XMP, xanthosine 5'-monophosphate; MMF, mycophenolate mofetil; MPAG, MPA glucuronide; HSA, human serum albumin; FBS, fetal bovine serum; DPBS, Dulbecco s PBS; and HBSS, Hanks' balanced salt solution.