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Incorporation rate of thymidine into nuclear DNA of cleaving sea urchin eggs is independent of the incubation time before fertilization. The incorporation rate into the single nucleus was found to be higher in later cleavage stages than immediately after fertilization. A constant value is reached after a certain time. Thymidine uptake is considered to be dependent on a transport mechanism starting with fertilization.

DNS-Synthese in frühen Furchungsstadien von Seeigelembryonen / DNA-Synthesis in Early Cleavage Stages of Sea Urchin Embryos