U2OS cells were stained with the Bioss antibody against H3K36me1 (cat. No. bs-53131R) and with DAPI. Cells were fixed with 4% formaldehyde for 20’ and blocked with PBS/TX-100 containing 5% normal goat serum. Figure A: cells were immunofluorescently labeled with the H3K36me1 antibody (left) diluted 1:500 in blocking solution followed by an anti-rabbit antibody conjugated to Alexa568 or with DAPI (right), which specifically labels DNA. Figure B, C, D, and E: staining of the cells with the H3K36me1 antibody after incubation of the antibody with 2 ng/μl blocking peptide containing the unmodified and the mono-, di- and trimethylated H3K36, respectively.