[Dynamics of a 3H-lysine pulse label in the culturing of L cells]

Using autoradiography, 3H-lysine, 3H-thymidine, and 3H-tryptophane puls labeled L-cells were examined as long as through four passages. Our studies demonstrate that no renewal of 3H-lysine labels takes place in chromosomes and nuclei. Unlike, the cytoplasmic labels of 3H-lysine and chromosomal, nuclear and cytoplasmic labels of 3H-tryptophane showed an intensive renewal. A question of renewal of lysine-rich histones is discussed.