Incorporation of exogenous DNA and its localization in the chromosomes of the host cell.

Incorporation of isologous 3H-DNA of exogenous origin into chromosomes of the L cells was investigated by means of autoradiographical technique. It was shown that during short time intervals of incubation of 3H-DNA with the host cells (1--3 hr), nearly double quantity of the mitoses was labelled, when compared with 3H-TdR used as a control. During longer time intervals, no difference between number of the mitoses labelled with 3H-TdR and exogenous isologous 3H-DNA was observed.