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- W1979152277 abstract "Mouse one-cell embryos were taken 1, 1.5, 2, 3, 4, 6, 8, 10, 13 and 18 h after insemination. One-cell parthenogenones were induced by treatment of mouse eggs obtained 20 h after HCG injection with hyaluronidase and cultured for 0.5, 1, 3, 4.5, 6, 8, 10, 12 and 24 h. Some parthenogenones were pulse-labelled with tritiated thymidine, cut and autoradiographed. Both the embryos and parthenogenones were Feulgen-stained, and integrated relative optical absorption of either pronuclei or nuclei of polar bodies was measured with a cytophotometer. In some fertilized eggs and parthenogenones the DNA synthesis sets in 4–6 h after either insemination or parthenogenetic stimulus. Between the 8th and 13th hour after insemination the fraction of DNA synthesizing embryonic pronuclei remained at the level 30–40%. Most parthenogenones duplicated their DNA content between the 8th and 12th hour after hyaluronidase treatment. The DNA synthesis time in pronuclei of embryos was determined to be 3.5–4.0 h and that of pronuclei of parthenogenones approx. 4 h. The minimal time of the G2 phase was estimated to be 3–5 h. The first labelled pronuclei of parthenogenones were detected 6 h after stimulus. Male pronuclei started and ended DNA synthesis earlier than female pronuclei. Differences in the DNA content between pronuclei of the parthenogenones (when there are two in one parthenogenone) were observed beginning with the 10th h after hyaluronidase treatment. The DNA content in the nuclei of the second polar bodies (PB) of embryos increased slowly between the 8th and 22nd hour after insemination, up to an overall value of 1.4 C. That of the nuclei of the polar bodies of parthenogenones accompanied the synthesis of DNA in pronuclei to the 10th hour after hyaluronidase treatment, up to an overall value of 1.4 C." @default.
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- W1979152277 date "1975-05-01" @default.
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- W1979152277 title "Pronuclear synthesis of DNA in fertilized and parthenogenetically activated mouse eggs *1A cytophotometric study" @default.
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- W1979152277 doi "https://doi.org/10.1016/0014-4827(75)90390-0" @default.
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