Potential TbTFIIB-interacting proteins from the TAP-TbTFIIB purification. The concentrated elution from the calmodulin resin was separated by electrophoresis in 10% polyacrylamide containing 0.1% sodium dodecyl sulfate. Proteins in bands 1–8 were identified through mass spectrometry and found to be 1) microtubule-associated protein (GenBank ID: 70832917), 2) heat shock protein 70 (GenBank ID: 123633), 3) conserved hypothetical protein Tb11.02.4300 (GenBank ID: 70834104), 4) β-tubulin (GenBank ID: 115504281), 5–7) TbTFIIB (GenBank ID: 70831131), and 8) conserved hypothetical protein Tb927.6.4440 (GenBank ID: 62358814). *Tb11.02.4300 consistently migrates 10 kDa higher than its molecular weight.