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![Xanthine Oxidase Activity Assay Kit (Colorimetric) [NBP3-24546] - Standard Reference Curve](http://images.novusbio.com/fullsize/nbp3-24546_xanthine-oxidase-activity-assay-kit-colorimetric-2611202315565841.png "Xanthine Oxidase Activity Assay Kit (Colorimetric) [NBP3-24546] - Standard Reference Curve")
![Xanthine Oxidase Activity Assay Kit (Colorimetric) [NBP3-24546] - Assay Example](http://images.novusbio.com/fullsize/nbp3-24546_xanthine-oxidase-activity-assay-kit-colorimetric-8120241131134.png)