1. 
   xanthosine
   9-beta-d-ribosylxanthine;the deamination product of guanosine (O replacing -NH2). ... Synonym: xanthine ribonucleoside. ... Abbreviation: Xao ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?xanthosine
   
   
2. 
   xanthosine
   (zan´tho-sēn) a nucleoside composed of xanthine and ribose.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   xanthosine
   (X, Xao) Type: Term Pronunciation: zan′thō-sēn, -sin Definitions: 1. the deamination product of guanosine (O replacing -NH₂). Synonyms: xanthine ribonucleoside
   Found op http://www.medilexicon.com/medicaldictionary.php?t=100157
   
   
4. 
   Xanthosine
   Xanthosine is a nucleoside derived from xanthine and ribose. ...
   Found op http://en.wikipedia.org/wiki/Xanthosine
   
   

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