FIG 5 .
Expression and cleavage of wild-type and mutant HA proteins in 293T cells. 293T cells were transfected with Flag-tagged HA expression plasmids. At 24 h posttransfection, cells were harvested and analyzed by Western blotting using anti-Flag antibody. (A) After quantitation of the band intensities by using ImageJ software, the amounts of expression and cleavage for each HA were calculated relative to those for EG/D1 (wt). Each data point is the mean ± SD from three independent experiments. Colors on the x axis highlight the categories of HA mutations as indicated. **, P < 0.01; *, P < 0.05 (Student’s t test). (B) Representative results of Western blotting for EG/D1 and the indicated HA mutants are shown.