[Dynamics of 3H-thymidine and 3H-deoxycytidine incorporation into the nuclei of a rabbit kidney cell culture during the S period].

Using a combined cytophotometric-autoradiographic method a study was made of 3H-thymidine and 3H-deoxycytidine incorporation rates into the interphase nuclei of rabbit kidney cell culture during the S-period. The rate of 3H-deoxycytidine (10(-4) M--10(-6) M) incorporation into nuclei increases throughout the first part of the S-period and decreases from its middle to the end. The patterns of variations of 3H-thymidine and 3H-deoxycytidine incorporation rates into the nuclei of cultured rabbit kidney cells during the S-period were identical.