Fixation and staining of the cells for stimulated emission depletion (STED) microscopy have been described previously [23 (link)]. Incubation with the primary antibody was performed overnight at 4 °C. The following antibodies were used: anti-Ku70 (#ab 83501) (Abcam, Berlin, Germany) and anti-IKKγ/NEMO (#SAB1404591) (Sigma-Aldrich, Taufkirchen, Germany). The following secondary antibodies were used: anti-rabbit ATTO 647N (dilution 1:200) and anti-mouse Chromeo 494 (dilution 1:50) (Active Motif, La Hulpe, Belgium).
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