A flow system has been developed for the continual microscopic observation of cultured nerve cells. The undefined effects of coexisting cells could be efficiently reduced by the continuous flow of a medium. The present flow system was useful also for the experiments requiring medium exchanges. Its performance was demonstrated by the repeated actions of NGF or db-cAMP to PC12h-R cells. The neurite projection and its retraction were repeatedly observed by the supply and the removal of those factors.
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