Figure 4.
Detection of honokiol‐mediated apoptosis in human OSCC cells. OC2 and OCSL cells treated with various concentrations of honokiol for 24, 48 and 72 hr, and the expression of caspase‐9, caspase‐8, Bid and cleavage forms of caspase‐3 was analysed by Western blotting. GAPDH was used as an internal control.