Figure 2

Apoptotic response of DBTRG-05 and U87-MG cells exposed to CPT working concentrations. A. Percentages of Annexin-V positive DBTRG-05 cells treated for 24 and 72 hours with 0.2 μM CPT. * p < 0.05, Student's t-test. ** p < 0.01, Student's t-test. B. Percentages of Annexin-V positive U87-MG cells treated for 24 and 72 hours with 1 μM CPT; bars, standard errors. ** p < 0.01, Student's t-test.