In accordance with the immunofluorescence data for treatment directly after infection (Fig. 3A and B), a decrease in PML-NB number upon treatment with 2 and 4 μM ATO could be observed at 3 and 6 dpt (Fig. 5A and B, panels b, f, j, n, r, v, z, ad, and ah). This evidence concerns the gene PML and infection.