Frequently in embryo development cells that are not used to construct the soma—the body of the new individual—are put aside but remain in stock as primordial germ cells. Such cells are known in nematodes, insects, and vertebrates.
Here, we show that the sperm cell possesses the unique property to drive steady and swift nuclear fusion. When we fertilized egg cells with sperm cells in vitro, the immediate fusion of the male and female nuclei in the zygote progressed. This rapid nuclear fusion did not occur when two ...
Spermatazoa are the male gamete,meaning they are the cells that fuse with the egg in fertilization giving rise to the embrion and future baby.
Sperm, male reproductive cell, produced by most animals. In higher vertebrates, especially mammals, sperm are produced in the testes. The sperm unites with (fertilizes) the ovum (egg) of a female to produce a new offspring. Mature sperm have two distingu
Cytoplasmic nucleoids in the generative cell of mature pollens, sperm cells of pollens cultured in vitro and egg cell of mature embryo sac in Calystegia hederacea Wall, were studied by means of the DNA fluorochrome DAPI in conjunction with epifluorescence microscopy for in situ detection of cyto...
C. Sperm guidance in mammals - an unpaved road to the egg. Nat. Rev. Mol. Cell Biol. 7, 276–285 (2006). 5. Suarez, S. S. & Pacey, A. A. Sperm transport in the female reproductive tract. Human Reproduction Update 12, 23–37 (2006). 6. Suarez, S. S., Brockman, K. & ...
CellJacquelineCellGrossniklausCellUeliCellEBSCO_AspScienceSprunck S, Rademacher S, Vogler F, Gheyselinck J, Gross- niklaus U, Dresselhaus T (2012) Egg cell-secreted EC1 triggers sperm cell activation during double fertilization. Science 338(6110):1093-1097. doi:10.1126/science.1223944...
Sex determination is an essential step in the commitment of a germ cell to a sperm or egg. However, the intrinsic factors that determine the sexual fate of vertebrate germ cells are unknown. Here, we show that foxl3, which is expressed in germ cells but not somatic cells in the gonad, ...
D. Chemotaxis of Arbacia punctulata spermatozoa to resact, a peptide from the egg jelly layer. J Cell Biol 101, 2324–2329 (1985). 33. Xiang, X., Burnett, L., Rawls, A., Bieber, A. & Chandler, D. The sperm chemoattractant "allurin" is expressed and secreted from the Xenopus ...
Fertilization integrates multiple cell-autonomous processes to transform a sperm and an oocyte (egg) into a totipotent embryo. In mammals, the fertilizing sperm triggers embryogenesis by inducing a calcium-dependent phospho-relay to remove the unique cytostatic factor, Emi2, resulting in metaphase II...