Files in this Data Supplement:

• Supplemental file 1 - Legends to Fig. S1 to S3
  MS Word document, 27K.
• Supplemental file 2 - Fig. S1 (Time course of mApe1 expression in response to sodium arsenite in 10T½ cells)
  Zipped EPS document, 320K.
• Supplemental file 3 - Fig. S2 (Human hAPE1 promoter activity in response to arsenite exposure)
  Zipped EPS document, 57K.
• Supplemental file 4 - Fig. S1 (Sequences conserved between the human and mouse APE1 genes)
  Zipped EPS document, 10.2MB.