Human osteosarcoma (U2OS) cells were stained with the Bioss antibody against H3K79me3 (Cat. No. bs-53121R) and with DAPI. Cells were fixed with 2.5% formaldehyde for 30’ and blocked with PBS/TX-100 containing 1% BSA. Figure A: cells were immunofluorescently labeled with the H3K79me3 antibody (left) diluted 1:300 in blocking solution followed by an anti-rabbit antibody conjugated to Alexa568 or with DAPI (right). Figure B and C: staining of the cells with the H3K79me3 antibody after incubation of the antibody with 2 ng/μl H4K20me3 and H3K79me3 peptide, respectively.