Provided is a method including providing a population of cells including a target type of differentiated cells having a pre-identified cytoskeletal profile and at least one cell selected from undifferentiated cells, differentiating cells and differentiated cells being different from the target type of differentiated cells; and incubating the population of cells with a cytotoxic agent, in an amount and for a time period effective to form a modified population of cells including predominantly or consisting essentially of the target type of differentiated cells. The pre-identified cytoskeletal profile can include the presence of class III β-tubulin on neuronal cells and the population of cells includes neural cells and neuronal cells.