Figure 1

Cytotoxic effects of herbal extracts in cultured primary mouse cortical neurons. The neuronal cells were exposed to 100 μg/ml of the herbal extracts for 24 h. Culture media (neurobasal medium supplemented with 2% B-27) containing vehicle only were used as a negative control (defined as 0%) and media containing staurosporine were used as positive control (defined as 100%).