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References in periodicals archive ?
Scientists can jolt the egg into reclaiming the DNA in the polar body.
After extrusion of the first polar body (PB1), the second meiotic spindle appeared.
Egr3 siRNA (25 [micro]M) was microinjected into GV oocytes and rates of GVBD and polar body extrusion were monitored.
The red ooplasm began streaming toward the vegetal pole soon after release of the 1st polar body, which is consistent with results of experimental work showing that morphogenetic determinants within equally cleaving gastropod eggs become segregated along the animal-vegetal axis between release of the 1st and 2nd polar bodies or between the 2nd polar body release and 1st cleavage (4).
During the specialized cell division that leads to the creation of egg cells, the leftover complement of 23 chromosomes gets packaged into a smaller cell called a polar body, which remains attached to the egg but eventually wastes away.
The stage of meiotic maturation was determined by examination of the presence or absence of the first polar body (metaphase II) under UV light.
After the 1st and 2nd polar body (PB) expulsions, fertilized oocytes were incubated at 28[degrees]C (Chao et al.
We are delighted to announce the world's first pregnancy using real time polar body array Comparative Genomic Hybridization (CGH) and the baby is due later in the spring," the Telegraph quoted Dr Simon Fishel, from the Care Fertility Group in Nottingham, as saying.
Polar body (PB) formation is common to all sexually reproducing animals, but many details of this critical process and its products remain to be elucidated.
Earlier chromosome tests were on cells biopsied from growing embryos and did not necessarily reflect the total status of the embryo (because of chromosome "mosaicism"); polar body analysis removes this potential problem
At 10 min of incubation, there was an extrusion of the second polar body, with characteristics, size, and location of appearance similar to the first polar body (Fig.
Extensive studies of meiotic spindle motility in mouse oocytes have revealed a detailed series of movements during meiotic asymmetric divisions: during first meiotic division, the MI spindle forms initially at the center of the oocyte and migrates toward the periphery; the first polar body (PB1) is extruded after microtubule-cortex attachment (Maro et al.