Figure 5: Western blot analysis of expression of apoptotic proteins (A - D) and stress proteins (E - F) ATO-treated A549 cells after 48 hr of exposure. The figures represent: A– caspase 3 expressions; B – p53 expression; C – cytochrome c expression; D – Bcl-2 expression; E – Hsp 70 expression; and F – cfos expression.