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-Five characteristic replication patterns of female XX chromosomes (top) and six cha· racteristic replication patterns of male XY chromosomes (bottom) in different phases of S, from cells exposed to tritiated thymidine (TdRH3).  

-Five characteristic replication patterns of female XX chromosomes (top) and six cha· racteristic replication patterns of male XY chromosomes (bottom) in different phases of S, from cells exposed to tritiated thymidine (TdRH3).  

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Our study concerning the replication of the chromosomal complement in the Romanian hamster (Mesocricetus newtoni) allows for the conclusion that the mitotic cycle is about 10–11 hours. Replication of the chromosomal complement develops asynchronously at both inter and intrachromosomal level. One of the X chromosomes in females begins its replicatio...