lentivirus generated in 60 mm dish, concentrated (PEGit), finally dissolved in 50ul PBS.
Transduced Jurkat cells and HEK 293 cells with 5ul virus each. Observed 90%GFP in HEK293 (50,000 cells-by this I would say 2*10^5 TU/ml titer got) but not in Jurkat cells (even after spinoculation), why so?