Sentences with phrase «for egg cell»

The term «egg» is used differently outside the animal kingdom, for an egg cell (sometimes called an ovum).

The open structure also allows room for the egg cells to mature and ovulate, as well as blood vessels to form within the implant enabling the hormones to circulate within the mouse bloodstream and trigger lactation after giving birth.

Not exact matches

After the woman's eggs have been retrieved through the normal IVF protocol and are ready for fertilization, the mitochondria taken from her stem cells are injected into an egg along with a sperm cell.

For instance, the egg - cell cytoplasm strips off all of the many epigenetic factors which differentiate a genetically restricted donor skin cell from a totipotent zygote.

RU - 486, which is not for sale in the U.S., blocks cells in the uterus from receiving the natural hormone progesterone, the function of which is to prepare the lining of the uterus to receive and sustain a fertilized egg.

Hartshorne has no patience for those holding a genetic view of personhood, who claim that the potential represented in a fertilized human egg cell is equivalent to an actual person.

If we say such cells have the potential of becoming human life, then Catholics are right to argue that the unjoined sperm and egg also have a similar potential for life, and anything that stops them joining (such as a condom or withdrawal) is morally equivalent to abortion.

Philippa Taylor explained why she thought it was an encouraging discovery: «There could be real benefits for some people, particularly young girls or people who are going through cancer treatment or chemotherapy and that destroys any chance of having their own eggs and growing eggs cells so if you can remove ovarian tissue, grow some egg cells outside the womb and implant them after the treatment then that could be very positive.»

For such a being is, in its body, a multicellular organism, a metazoan — to use the scientific Greek — and the egg is a single cell.

For example in the fruit fly the first difference between the front and back end of the egg is caused by the cells of the mother's ovary, external to the egg, that release at the anterior end a specific chemical which then diffuses backwards, giving rise to a chemical gradient of concentration.

For many people, the fear of a class of genetically enhanced people is reason enough not to tinker with the DNA of the human germline — eggs, sperm, embryos and the cells that give rise to eggs and sperm.

Altering DNA in germline cells — embryos, eggs, and sperm, or cells that give rise to them — may be used to cure genetic diseases for future generations, provided it is done only to correct disease or disability, not to enhance people's health or abilities, a report issued February 14 by the National Academies of Sciences and Medicine recommends.

Asexual whiptails have a special trick for making spermless reproduction work: The egg cells in other animals first double their choromosomes once and then divide twice, leaving them as haploid cells, with half the normal number of genetic material.

Fertile eggs have been created from mouse skin cells for the first time, raising the prospect of new fertility treatments and babies with two genetic fathers

Combining an egg's genetic leftovers with donor cells may be a way to double the number of eggs available for IVF in women whose ovarian reserve is running low

For the first time, researchers have made something resembling a mouse embryo without using an egg cell, allowing them to probe the early steps of development

The idea is that the mitochondria — cellular energy generators — in young, primitive cells function much better than those in the mature eggs collected for IVF.

The study also found that in addition to its role in determining the sex of somatic cells, Sxl regulation by m6A is required to initiate germline stem cell differentiation for developing eggs.

She found that the egg cell expels the two mother centrioles, jettisoning them into the two «polar bodies» that also serve as dumps for its surplus genetic material.

To investigate how the egg cell manages to rid itself of such a resilient structure, Joana Pinto, a PhD student in the Lénárt lab, developed fluorescent tags for mother and daughter centrioles in a starfish egg cell and recorded the entire process of eliminating them.

Stem cells capable of forming new eggs could promise limitless eggs for IVF treatments, and the rejuvenation of older eggs

Jonathan Tilly and colleagues at Massachusetts General Hospital in Boston first challenged the idea that mammals are born with a limited supply of eggs back in 2004, when they found evidence for ovarian stem cells in...

«If gdf3 is not supplied to the egg by the mother, the fertilized egg can not produce two of the three major types of cells required for development,» Burdine said.

In a new study, Murphy, a molecular biologist at Princeton University, showed that long - lived bodily, or somatic, cells in Caenorhabditis elegans, a one - millimeter nematode commonly used as a model for aging studies in labs, activate genetic pathways completely separate from those found in long - lived egg, or oocyte, cells.

It might be sperm cells on their way to an egg, a fleet of bacteria off to stir up trouble in your guts or a flock of birds heading for their wintering grounds.

Although the bulk of the commercial manufacturing uses cultures of bacteria, such as Escherichia coli or Chinese hamster ovary cells, a few biotech companies are trying to produce therapeutic proteins in the milk of transgenic mammals (such as GTC Biotherapeutics, which is using goats; PPL Therapeutics, which is using sheep; and BioProtein Technologies, which is working with rabbits), transgenic chicken eggs (such as Avigenics or Vivalis), or even in transgenic crops (such as ProdiGene or Meristem Therapeutics); but it is early days for these «pharming» methods.

Using a powerful microscope to observe mouse oocytes as they split, Ellenberg's group found that the spindles assembled into two coherent structures, one for the future egg and one for the future polar body.At first, spindles appeared throughout the cell in a sort of mesh.

«It's been a debate for many years, whether there were indeed cells in the adult ovary capable of forming new eggs,» says Evelyn Telfer, a reproductive biologist at the University of Edinburgh who wasn't part of the new study.

But these fertilised eggs never progressed beyond the two - cell stage, well short of the eight - cell embryo needed for re-implantation.

Although biologists have known for decades that egg cells provide sperm with a little chemical encouragement to reel them in, the molecular nature of this interaction has remained elusive.

For some reason their eggs contain the same 44 chromosomes as their body cells — 22 from the mother and 22 from the father — instead of half, and so the eggs can grow into gecko hatchlings without first being fertilized by sperm.

For instance, cells from a man's skin could theoretically be used to create eggs that are fertilized with a partner's sperm, then nurtured in the womb of a surrogate.

They have made it easy for anyone with basic molecular biology training to insert, remove, and edit genes in cells, including sperm, eggs, and embryos, potentially curing genetic diseases or adding desirable traits.

They then purified messenger RNA — a molecule that plays a key role in the production of proteins — from the cells in the animals» upper intestines, injected the mRNA into immature eggs cells, and looked for changes in iron uptake.

In an advance that could lead to new fertility treatments, researchers have coaxed immature human egg cells to fully develop in the lab for the first time.

Some scientists, such as Kevin Eggan at Harvard, were disappointed that NIH didn't open the door to the use of embryos created for research purposes — including through somatic cell nuclear transfer (cloning) and parthenogenesis (from an unfertilized egg).

Even though the reproductive age for humans is around 15 — 45 years old, the precursor cells that go on to produce human eggs or sperm are formed much earlier, when the fertilized egg grows into a tiny ball of cells in the mother's womb.

«Adults lack stem cells for making new eggs.»

The company uses cells to grow the virus for the vaccine and claims that this «shows significant time saving» over traditional production with eggs.

Stem cell researchers call them «a major step in the right direction,» although some were disappointed that NIH didn't open the door to the use of embryos created for research purposes — including through somatic cell nuclear transfer (cloning) and parthenogenesis (from an unfertilized egg).

The idea is that, by placing an adult cell from a diabetic, for example, into a human egg cell, the egg cell could turn back the clock of the adult DNA, or reprogram it, to its initial, pristine state.

The problem, he believes, is that Harvard Stem Cell Institute researchers, following ethics guidelines, decided not to pay women to donate their eggs for research.

After nearly a year of recruitment efforts, not a single woman consented to donate her eggs for stem cell research.

Paying for human eggs, many bioethicists argue, commodifies a human resource; Sandel, for example, a proponent of both research cloning and embryonic stem cell research, opposes the idea of financial inducement for what he calls «human reproductive capacity.»

At the July meeting of the European Society for Human Reproduction and Embryology in Madrid, scientists were horrified — and transfixed — by two presentations: one that explored adding cells to developing embryos and another that outlined a process of growing egg cells from aborted human fetuses.

These cells need to «forget» their own programmed instructions and create a blank slate for the blueprint of either a sperm or egg cell to be laid down.

The process begins when a gene for a molecule with a potentially toxic function, like a protein - chopping enzyme, is accidentally duplicated, typically during the formation of egg cells and sperm.

Williams contends that these innovations took hold at least 125 million years ago and made it possible for early angiosperms to evolve more flexible and sheltered modes of fertilization, including ovaries containing egg cells deep inside the plant.

Although the researchers had first removed the DNA of both the egg and the fertilizing sperm, the egg was still primed for cell division and development, increasing the chances of success, the team says.

Infertility treatments once considered revolutionary are now commonplace: If a man has a low sperm count, sperm cells can be retrieved from a testicle for direct injection into an egg's cytoplasm.