The histone code, which refers to the methylation states of lysine residues on histone proteins, plays a significant role in determining the transcriptional state of associated DNA coding regions. Histone lysine demethylases remove methyl groups from methylated lysine sidechains on histones, countering the reactions catalyzed by histone lysine methyltransferases. Studies aim to identify and utilize small molecules to selectively inhibit individual histone-modifying enzymes or enzyme subfamilies to define biological roles of these epigenetic modulator enzymes. Is the molecule effective to this assay?