Figure 2: Effects of HL on protein expression of p21 (A) and p27 (B) in NSCLC cells. The cells were treated with 200 μM HL for 48 hours. Cell cycle-related proteins were detected by enzyme immunometric assay. *Significantly different (p<0.05) compared with the controls (Student’s t-test); data are the mean ± standard error (n=3-8) from two independent experiments.