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Abstract
DNA synthesis in diploid human cells was studied at the cellular and chromosomal levels by means of <sup>3</sup>H-thymidine labeling and autoradiography. It was observed that the rate of DNA synthesis increased slowly at the beginning and decreased rapidly at the end of the S period, with a peak midway in the period. The rate and duration of DNA synthesis in individual chromosomes were found to be characteristic for each chromosome pair. Even though there is a certain tendency for the longer chromosomes to have a longer S period, enough variation existed to indicate that the structural make-up of the chromosomes may play an important role in the rate and length of time during which chromosomal DNA synthesis occurs.
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