Files in this Data Supplement:

• Supplemental file 1 - Fig. S1 (tCid1 displays stronger PUP than PAP activity)
  TIF document, 2.1MB.
• Supplemental file 2 - Fig. S2 (Yeast PAP lacks PUP activity in competitive conditions)
  TIFF document, 1.5MB.
• Supplemental file 3 - Fig. S3 (Cid1 complexes do not have significant ATPase activity)
  TIFF document, 2.6MB
• Supplemental file 4 - Fig. S4 (U6 snRNA is not oligouridylated in S. pombe)
  TIFF document, 467K.
• Supplemental file 5 - Legends to Fig. S1 to S4
  Word document, 26K.
• Supplemental file 6 - Tables S1 and S2 (Actin 3' ends from cdc20-P7 cells at 30 degrees C S1 and 36 degrees C S2), S3 (Actin 3' ends from cdc20-P7 cid1α cells at 36 degrees C), and S4 (Oligonucleotides used in this study)
  Word document, 84K.