TRIM28 and infection: We observed that TRIM28 S473 was also phosphorylated upon infection with the mouse-adapted HPAIV variant A/seal/Mass/1-SC35M/80 (SC35M, H7N7) and the HPAIV strains A/Vietnam/1203/2004 (VN, H5N1), A/Anhui/1/2013 (Anhui, H7N9) but not with the human-adapted 2009 pandemic H1N1 strain A/Hamburg/04/2009 (H1N1pdm) (Figure 1C upper panels).