共查询到20条相似文献,搜索用时 31 毫秒
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P. E. Binkerd A. G. Hendrickx J. M. Rice A. E. Palmer 《American journal of primatology》1984,6(1):15-29
The developmental stages of 12 Erythrocebus patas embryos, ranging in gestational age from 30 to 50 days, is described. The pattern of embryogenesis in E. patas closely parallels the anatomic characteristics of human and other nonhuman primate embryos between stages 12 and 23. However, there is a delay in development in E. patas similar to that observed in human embryos which differs from the macaques and baboons. This temporal difference in the embryonic period is an important factor in the design and analysis of early pregnancy studies in this species. 相似文献
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Nanog expression in mouse germ cell development 总被引:12,自引:0,他引:12
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Cytoplasmic alteration of an established pattern of Rana pipiens chromosomal DNA replication 总被引:1,自引:0,他引:1
Cells from Rana pipiens embryos were incubated in 3H-thymidine for the duration of the last quarter of the S period plus the G2 period of the cell cycle. Chromosomes of animal hemisphere cells of stage 9 embryos showed uniform labeling, whereas chromosomes of endodermal cells of stage 17 embryos showed terminal labeling. We tested whether egg cytoplasm would alter an established temporal pattern of chromosomal DNA replication. Nuclei from disaggregated endodermal cells of stage 17 embryos were transplanted into activated and enucleated eggs. The eggs were then allowed to develop to the blastula stage. Animal hemisphere explants of these blastulae were incubated in 3H-thymidine. Radioautographic localization of silver halide grains demonstrated a chromosomal DNA replication pattern that was uniform over the the metaphase chromosomes. The egg cytoplasm had evidently altered an established temporal pattern of chromosomal DNA replication. 相似文献
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