Yes, you can add polyT tail to your beads. But it is easier to buy beads
from supplier, beads from Advanced Biotechnologies
(http://www.adbio.co.uk/) or Novagen ( supplied by Cambridge Bioscience
01223 316855) are cheaper.
-Kolarova, H. and Hengerer (1996)
Preparation of magnetic oligo(dT) particles.
BioTechniques 20(2), 196-8.
n.kaushik at ic.ac.uk