EHMT2 and Alzheimer disease: A new study [2] has found the increased histone H3 dimethylation at lysine 9 (H3K9me2, a repressive histone mark) and its catalyzing enzyme euchromatic histone-lysine N-methyltransferase 2 (EHMT2) in prefrontal cortex (PFC) of the P301S Tau AD mouse model.