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Fig. 2. Immunoblot analysis of CHO K1 and xrs-5 cell extracts. Nuclear (N; panels A and B, lanes 3 and 5) or cytoplasmic (C; panels A and B, lanes 2 and 4) cell extracts from CHO K1 or xrs-5 cells were examined by western blotting using a Ku86 (A) or Ku70 (B) antibody. HeLa whole-cell extracts (lane 1) were used as positive controls.