BacMam histone cellular assay kits allow researchers to choose the histone modification that corresponds to their enzyme of interest in their preferred cell background. The newest additions are for epigenetic researchers studying Histone H3 methylation. Specific lysine methylation is detected using a terbium-labeled methylation-specific antibody in combination with a BacMam expressed GFP-Histone H3 substrate in a homogenous TR-FRET format.