In vitro transduction of vesicular stomatitis virus G protein (VSV-G)-pseudotyped lentivirus (LV) encoding β-Gal in colonic cell lines. (A) Percentage of cells transduced by the VSV-G-pseudotyped LV. One hundred cells were counted in three randomly selected, non-adjacent fields in triplicate. (B) Colon adenocarcinoma cell lines showing evidence of β-Gal transduction following exposure to 10 ng p24 of vector. All values were expressed as means ± SD. *p < 0.05 compared with the results of 0.1 ng p24 VSV-G LV transduction.