NEW sealed. Trevigen CometSlide 2 Well Assay Microscope Slides. Catalog Number 4250-200-03. 100 tests. CometSlide is a component of the CometAssay Kit which is used for the rapid analysis of DNA fragmentation associated with DNA damage. It is a 2-well slide that is specially treated to promote agarose adherence and easy application of cells directly to each well, providing a convenient, simple, and reliable format for sample preparation, processing, analysis, and storage for the CometAssay.