Tax partially colocalizes with nuclear proteasomes outside Tax-induced nuclear bodies. Confocal microscopy was performed as described in Materials and Methods. (A to D) Uninfected 293T cells. (E to H) SFV-Tax-infected 293T cells, 18 h postinfection. (A, E) Differential interference contrast. (B, F) Proteasome staining with MCP21 antibody. (C, G) Tax staining with anti-HA antibody. (D, H) Superimposition of panels B and C and panels F and G, respectively. The yellow color in panel H indicates the overlap of MCP21 and anti-HA staining.