Files in this Data Supplement:

• Supplemental Table 1 (Microsoft Excel, 99 KB) - Includes all transcription factor genes that are present (P) in ALL stages of T lymphopoietic differentiation but DO NOT fluctuate greater than twofold at any individual transition.
  
  
• Supplemental Table 2 (Microsoft Excel, 159 KB) - Includes all transcription factor genes cited in any table or figure of the manuscript, i.e., this is a master list of absolute calls and signal levels.
  
  
• Supplmental Table 3 (Microsoft Word, 58 KB) - Includes a categorical summary (rather than an alphabetical listing) of the transcription factors included in Table 1 on the manuscript.