Tax is recruited to preexisting Ubc9 nuclear bodies. (A) HeLa cells were cotransfected with Ubc9-GFP and empty vector or Tax and stained by immunofluoresence with anti-Tax mAb (red). (B) HeLa cells were cotransfected with Ubc9-GFP and empty vector or Tax and stained by immunofluoresence with anti–HTLV-I sera (blue) and anti-PML mAb (red). (C) MEFs were transfected with Tax and stained by double immunofluoresence with anti-Tax mAb (green) and anti-Ubc9 polyclonal antibody (red). Scale bar, 10 μm.