MEF2C and nasopharyngeal carcinoma: At 14 days post infection (dpi, during the NPC stage), lenti-shMEF2C-1—infected cells displayed an ∼2-fold higher level of cell death than scrambled control-infected cells or lenti-shMEF2C-2—infected cells (Figure 3A), consistent with an early effect of MEF2C on cell viability.