Table II. Induction of neurocytotoxicity by nanomolar concentration of paclitaxel. PC12 cells were induced to differentiate by treatment for 5 days with 50 ng/ml nerve growth factor and treated for 24 h withoutor with 5 nM paclitaxel. The percentage of differentiated cells with neurites was scored by counting at least 100 cells per well. Each value represents mean±S.D. from six determinantions.