Inhibitory effect of all-trans retinoic acid on human hepatocellular carcinoma cell proliferation

Figure 3 The expression of Caspase-3. All the control groups showed weak signals at the position of 32kD, suggesting the presence of Caspase-3 (Lane 2). For the ATRA-treated cells, the 32kD signal was shown to be stronger. In addition, an-other signal at the position of 20kD was detected. The latter represented the p20 subunit of Caspase-3, an active form of the molecule (Lane 1).