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Comparison between the direct (suspension cells) and delayed (adherent cells) titration methods of LvV stocks. Titers of LvVs were determined 48 h after transduction of NIH3T3 cells. The calculated LvV titer was significantly higher for NIH3T3 cells infected in suspension when compared with cells infected while adhering to cell culture plates (n=3; *P<0.001). LvV, lentiviral vector; TU, transduction units.
