MEFs infected with viruses expressing just Multicilin, alone or with wildtype E2f4, showed a weak expansion in centriole number (based on γ-Tubulin or Sas-6 staining) with only a small fraction of cells (<10%) responded significantly by increasing centriole number even when examined 3 days of infection (Figs 1e,f, S2b,d). This evidence concerns the gene SASS6 and infection.