ACTB and infection: As shown in Figure 6, transcriptions of cellular cytoskeleton genes, β-Actin and β-Tubulin declined dramatically 8-12 h post infection (p.i.), whereas the mRNA level of Su(var) 3-9 increased to more than threefold higher than that of the control after 12 h p.i. The transcriptions level of HP1a and HP1b remain similar to those in the control.