the time of s-phase replication of the mt genes was ascertained by determining the period of s phase wherein cadmium-resistant ( cdr ) cells could be induced with highest frequency by pulse treatment of synchronized cds cells with the hypomethylating drug 5-azacytidine ( 5-aza-cr ) , and by analyzing southern blots of density fractionated dnas isolated from synchronized cells pulse-labeled with brdu during different intervals after release from hydroxyurea blockade .
C0080129
s phase
C0007634
cells