Editing Uric acid (section)

====Uric acid stone formation====
[[File:Urine crystals comparison.png|thumb|Comparison of different types of urinary crystals.]]
[[Kidney stone]]s can form through deposits of sodium urate microcrystals.<ref name="Banach">{{cite journal |last1=Banach |first1=K. |last2=Bojarska |first2=E. |last3=Kazimierczuk |first3=Z. |last4=Magnowska |first4=L. |last5=Bzowska |first5=A. |date=2005 |title=Kinetic Model of Oxidation Catalyzed by Xanthine Oxidase—The Final Enzyme in Degradation of Purine Nucleosides and Nucleotides |journal=Nucleic Acids |volume=24 |issue=5–7 |pages=465–469 |doi=10.1081/ncn-200060006 |pmid=16247972 |s2cid=42906456}}</ref>

Saturation levels of uric acid in blood may result in one form of [[kidney stone]]s when the urate crystallizes in the kidney. These uric acid stones are [[radiodensity|radiolucent]], so do not appear on an abdominal plain [[X-ray]].<ref>{{Cite journal |last1=Worcester |first1=E. M. |last2=Coe |first2=F. L. |date=2008 |title=Nephrolithiasis |journal=Primary Care: Clinics in Office Practice |language=en |volume=35 |issue=2 |pages=369–391 |doi=10.1016/j.pop.2008.01.005 |pmc=2518455 |pmid=18486720}}</ref> Uric acid crystals can also promote the formation of [[calcium oxalate]] stones, acting as "seed crystals".<ref>{{cite journal |last=Pak |first=C. Y. |date=September 2008 |title=Medical stone management: 35 years of advances |journal=The Journal of Urology |volume=180 |issue=3 |pages=813–819 |doi=10.1016/j.juro.2008.05.048 |pmid=18635234}}</ref>