Celice v suspenziji ali enoplastni kulturi se za ustrezno časovno obdobje izpostavijo preizkušani snovi, ob aktivaciji presnove in brez nje, in se kultivirajo na novem gojišču, da se določi citotoksičnost in se omogoči izražanje fenotipa pred selekcijo mutant (9) (10) (11) (12) (13).
Cells in suspension or monolayer culture are exposed to the test substance, both with and without metabolic activation, for a suitable period of time and subcultured to determine cytotoxicity and to allow phenotypic expression prior to mutant selection (9) (10) (11) (12) (13).