Kaurene diterpene induces apoptosis in U87 human malignant glioblastoma cells by suppression of anti-apoptotic signals and activation of cysteine proteases - Lizarte Neto, Fermino Sanches; Tirapelli, Daniela Pretti da Cunha; Ambrosio, S. R.; Tirapelli, Carlos Renato; Oliveira, F. M.; Novais, P. C.; Peria, Fernanda Maris; Oliveira, Harley Francisco de; Carlotti Júnior, Carlos Gilberto; Tirapelli, Luis Fernando (Brazilian Journal of Medical and Biological Research, 2013)