Kaurene diterpene induces apoptosis in U87 human malignant glioblastoma cells by suppression of anti-apoptotic signals and activation of cysteine proteases. - Lizarte Neto FS; Tirapelli DP; Ambrosio SR; Tirapelli CR; Oliveira FM; Novais PC; Peria FM; Oliveira HF; Carlotti Junior CG; Tirapelli LF (Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologica, 2013)