The Epigenase JMJD3/UTX Demethylase Activity/Inhibition Assay Kit (Colorimetric) is a complete set of optimized reagents, designed for measuring activity/inhibition of JMJD3 and UTX using nuclear extracts or purified enzymes from a broad range of species such as mammals, plants, fungi, and bacteria, in a variety of forms including, but not limited to cultured cells and fresh and frozen tissues.