[Incorporation of 3H-5 uridine and 3H-5 leucine into cultured planarian cells, Polycelis tenuis (Iijima) in vitro].

RNA and protein synthesis in Planarian cells cultivated in vitro was studied by histoautoradiography. In the non-differentiated cells, uptake of precursor is intense from the beginning of the culture, and sensitive to addition of trophic factor known for their activating effect on mitosis and regeneration. On the contrary the rate of incorporation in differentiated cells is low and uniform, independently of the differents factors added to the medium.