LMP1 enhances HDFa cellular proliferation over the course of a week. (a) HDFa cells were cultured in conditioned medium from MDCK-pLNSX control cells, LMP1-expressing cells and serum free medium over a 7-day time course prior to cell counting. The results depict cell number (mean ± SD, n = 3). Asterisk indicates significant difference, determined using the Student t-test, from day 1 of the same conditions (p < 0.01). (b) HDFa cells were cultured in conditioned medium from MDCK-pLNSX control cells, LMP1-expressing cells and serum free medium over a 7-day time course prior to trypan blue exclusion assay. The results depict % viable cells (mean ± SD, n = 3). Using the Student t-test no significant differences were found between conditions (p ≥ 0.05).