HeLa cells cultured on coverslips were fixed in 4% paraformaldehyde then stained with ab2179 (green) at a concentration of 5µg/ml. The DNA stained with DAPI is shown in red (100x magnification).

HeLa cells were treated with 15µM Bleomycin for 2 hours to generate DNA double stranded breaks (DSBs). Paraformaldehyde-fixed cells were co-immunofluorescently labelled with anti-gamma H2AX (DNA DSB marker) and anti-BLM (ab2179). ab 2179 was used at a concentration of 5µg/ml. Colocalization at the sites of DNA DSBs is identified by the arrows. In the final panel DAPI is pseudo-coloured blue, while anti-gamma H2AX and anti-Blm are green and red respectively.