Tax-P79AQ81A is defective for nuclear body formation. Confocal microscopy analysis performed in (A) HeLa cells; (B) 293 T cells or (C) CEM T cells showing the distribution of wt Tax or Tax-P79AQ81A (green). Nuclei were stained with DAPI (blue). The percentages of cells containing Tax in nuclear bodies (NB) are indicated, and Tax nuclear bodies are pointed with arrows. At least 100 cells were analyzed in each condition.