FANCJ-R707C fails to suppress single-stranded DNA or Rad51 persistence in cells exposed to CisPt. fancj−/− cells transfected with pEGFP-Vector, pEGFP-FANCJ-WT (FANCJ-WT), pEGFP-FANCJ-R707C (FANCJ-R707C) or pEGFP-FANCJ-H396D (FANCJ-H396D) were exposed for 14 h to CisPt (1 μM) (A, B) or APH (200 nM) (C, D). Note that for BrdU staining, cells were pre-labeled with BrdU prior to drug exposure as described in Materials and Methods. (A, C) Immunofluorescent BrdU foci (A) or Rad51 foci (C) were detected by Alexa fluor 488 and are shown along with DAPI, or merged (DAPI and Alexa fluor 488). (B, D) Quantitative analyses of BrdU foci (B) or Rad51 foci (D) are shown with S.D. indicated by error bars.